flua: don't allow dlopen, et al., for bootstrap flua

There are some logistics issues that need to be sorted out here before we
can actually allow this to work.

lib/liblua/luaconf.h

@@ -75,8 +75,10 @@
 /* Local modifications: need io.popen */
 #ifdef __FreeBSD__
 #define LUA_USE_POSIX
+#ifndef BOOTSTRAPPING
 #define LUA_USE_DLOPEN
 #endif
+#endif
 
 /*
 @@ LUA_C89_NUMBERS ensures that Lua uses the largest types available for

libexec/flua/Makefile

@@ -30,6 +30,10 @@ CFLAGS+=	-DLUA_PROGNAME="\"${PROG}\""
 CFLAGS+=	-DLUA_USE_READLINE
 CFLAGS+=	-I${SRCTOP}/lib/libedit -I${SRCTOP}/contrib/libedit
 LIBADD+=	edit
+LDFLAGS+=	-Wl,-E
+.else
+# We don't support dynamic libs on bootstrap builds.
+CFLAGS+=	-DBOOTSTRAPPING
 .endif
 
 UCLSRC?=	${SRCTOP}/contrib/libucl
@@ -38,6 +42,4 @@ SRCS+=	lua_ucl.c
 CFLAGS+=	-I${UCLSRC}/include -I${UCLSRC}/src -I${UCLSRC}/uthash
 LIBADD+=	ucl
 
-LDFLAGS+=	-Wl,-E
-
 .include <bsd.prog.mk>