msun/x86: convert rest of the extern inline fenv functions to proper linkage

namely
	fegetexceptflag(3)
	fetestexcept(3)
	fesetround(3)
	fegetround(3)
	fesetenv(3)
Same as it was done in f39754d51b for feclearexcept(3).

PR:	277958
Reviewed by:	dim
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D56139

lib/msun/amd64/fenv.c

@@ -52,7 +52,11 @@ int
 	return (__feclearexcept_int(excepts));
 }
 
-extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
+int
+(fegetexceptflag)(fexcept_t *flagp, int excepts)
+{
+	return (__fegetexceptflag_int(flagp, excepts));
+}
 
 int
 fesetexceptflag(const fexcept_t *flagp, int excepts)
@@ -82,9 +86,23 @@ feraiseexcept(int excepts)
 	return (0);
 }
 
-extern inline int fetestexcept(int __excepts);
-extern inline int fegetround(void);
-extern inline int fesetround(int __round);
+int
+(fetestexcept)(int excepts)
+{
+	return (__fetestexcept_int(excepts));
+}
+
+int
+(fegetround)(void)
+{
+	return (__fegetround_int());
+}
+
+int
+(fesetround)(int round)
+{
+	return (__fesetround_int(round));
+}
 
 int
 fegetenv(fenv_t *envp)
@@ -115,7 +133,11 @@ feholdexcept(fenv_t *envp)
 	return (0);
 }
 
-extern inline int fesetenv(const fenv_t *__envp);
+int
+(fesetenv)(const fenv_t *envp)
+{
+	return (__fesetenv_int(envp));
+}
 
 int
 feupdateenv(const fenv_t *envp)

lib/msun/i387/fenv.c

@@ -94,7 +94,11 @@ int
 	return (__feclearexcept_int(excepts));
 }
 
-extern inline int fegetexceptflag(fexcept_t *__flagp, int __excepts);
+int
+(fegetexceptflag)(fexcept_t *flagp, int excepts)
+{
+	return (__fegetexceptflag_int(flagp, excepts));
+}
 
 int
 fesetexceptflag(const fexcept_t *flagp, int excepts)
@@ -127,9 +131,23 @@ feraiseexcept(int excepts)
 	return (0);
 }
 
-extern inline int fetestexcept(int __excepts);
-extern inline int fegetround(void);
-extern inline int fesetround(int __round);
+int
+(fetestexcept)(int excepts)
+{
+	return (__fetestexcept_int(excepts));
+}
+
+int
+(fegetround)(void)
+{
+	return (__fegetround_int());
+}
+
+int
+(fesetround)(int round)
+{
+	return (__fesetround_int(round));
+}
 
 int
 fegetenv(fenv_t *envp)
@@ -166,7 +184,11 @@ feholdexcept(fenv_t *envp)
 	return (0);
 }
 
-extern inline int fesetenv(const fenv_t *__envp);
+int
+(fesetenv)(const fenv_t *envp)
+{
+	return (__fesetenv_int(envp));
+}
 
 int
 feupdateenv(const fenv_t *envp)

lib/msun/x86/fenv.h

@@ -108,7 +108,7 @@ int feraiseexcept(int __excepts);
 int feupdateenv(const fenv_t *__envp);
 
 __fenv_static inline int
-fegetround(void)
+__fegetround_int(void)
 {
 	__uint16_t __control;
 
@@ -144,7 +144,18 @@ fegetexcept(void)
 #endif /* __BSD_VISIBLE */
 
 int feclearexcept(int);
+int fegetexceptflag(fexcept_t *, int);
+int fetestexcept(int);
+int fesetround(int);
+int fegetround(void);
+int fesetenv(const fenv_t *);
+
 #define	feclearexcept(a)	__feclearexcept_int(a)
+#define	fegetexceptflag(e, a)	__fegetexceptflag_int(e, a)
+#define	fetestexcept(a)		__fetestexcept_int(a)
+#define	fesetround(a)		__fesetround_int(a)
+#define	fegetround()		__fegetround_int()
+#define	fesetenv(a)		__fesetenv_int(a)
 
 #ifdef __i386__
 
@@ -188,7 +199,7 @@ __feclearexcept_int(int __excepts)
 }
 
 __fenv_static inline int
-fegetexceptflag(fexcept_t *__flagp, int __excepts)
+__fegetexceptflag_int(fexcept_t *__flagp, int __excepts)
 {
 	__uint32_t __mxcsr;
 	__uint16_t __status;
@@ -203,7 +214,7 @@ fegetexceptflag(fexcept_t *__flagp, int __excepts)
 }
 
 __fenv_static inline int
-fetestexcept(int __excepts)
+__fetestexcept_int(int __excepts)
 {
 	__uint32_t __mxcsr;
 	__uint16_t __status;
@@ -217,7 +228,7 @@ fetestexcept(int __excepts)
 }
 
 __fenv_static inline int
-fesetround(int __round)
+__fesetround_int(int __round)
 {
 	__uint32_t __mxcsr;
 	__uint16_t __control;
@@ -241,7 +252,7 @@ fesetround(int __round)
 }
 
 __fenv_static inline int
-fesetenv(const fenv_t *__envp)
+__fesetenv_int(const fenv_t *__envp)
 {
 	fenv_t __env = *__envp;
 	__uint32_t __mxcsr;
@@ -283,7 +294,7 @@ __feclearexcept_int(int __excepts)
 }
 
 __fenv_static inline int
-fegetexceptflag(fexcept_t *__flagp, int __excepts)
+__fegetexceptflag_int(fexcept_t *__flagp, int __excepts)
 {
 	__uint32_t __mxcsr;
 	__uint16_t __status;
@@ -295,7 +306,7 @@ fegetexceptflag(fexcept_t *__flagp, int __excepts)
 }
 
 __fenv_static inline int
-fetestexcept(int __excepts)
+__fetestexcept_int(int __excepts)
 {
 	__uint32_t __mxcsr;
 	__uint16_t __status;
@@ -306,7 +317,7 @@ fetestexcept(int __excepts)
 }
 
 __fenv_static inline int
-fesetround(int __round)
+__fesetround_int(int __round)
 {
 	__uint32_t __mxcsr;
 	__uint16_t __control;
@@ -328,7 +339,7 @@ fesetround(int __round)
 }
 
 __fenv_static inline int
-fesetenv(const fenv_t *__envp)
+__fesetenv_int(const fenv_t *__envp)
 {
 
 	/*