Retire BINUTILS and BINUTILS_BOOTSTRAP options

As of r361857 all BINUTILS options are disabled by default - ports
have been changed to depend on binutils if they require GNU as, and
all base system assembly files have been switched to use Clang's
integrated assembler.

Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation

share/mk/src.opts.mk

@@ -200,8 +200,6 @@ __DEFAULT_YES_OPTIONS = \
 __DEFAULT_NO_OPTIONS = \
     BEARSSL \
     BHYVE_SNAPSHOT \
-    BINUTILS \
-    BINUTILS_BOOTSTRAP \
     BSD_GREP \
     CLANG_EXTRAS \
     DTRACE_TESTS \
@@ -288,9 +286,9 @@ __DEFAULT_NO_OPTIONS+=LLVM_TARGET_BPF
 
 .include <bsd.compiler.mk>
 
-# In-tree binutils/gcc are older versions without modern architecture support.
+# In-tree gdb is an older versions without modern architecture support.
 .if ${__T} == "aarch64" || ${__T:Mriscv*} != ""
-BROKEN_OPTIONS+=BINUTILS BINUTILS_BOOTSTRAP GDB
+BROKEN_OPTIONS+=GDB
 .endif
 .if ${__T:Mriscv*} != ""
 BROKEN_OPTIONS+=OFED
@@ -469,14 +467,12 @@ MK_ZONEINFO_LEAPSECONDS_SUPPORT:= no
 .endif
 
 .if ${MK_CROSS_COMPILER} == "no"
-MK_BINUTILS_BOOTSTRAP:= no
 MK_CLANG_BOOTSTRAP:= no
 MK_ELFTOOLCHAIN_BOOTSTRAP:= no
 MK_LLD_BOOTSTRAP:= no
 .endif
 
 .if ${MK_TOOLCHAIN} == "no"
-MK_BINUTILS:=	no
 MK_CLANG:=	no
 MK_GDB:=	no
 MK_INCLUDES:=	no