Mk/Uses/fortran.mk: remove -B from LDFLAGS

That flag makes the compiler use /usr/local/bin/ld from devel/binutils.
The base system was stuck with an old GPLv2 version of binutils at the
time and lang/gcc required a newer version.

With LLVM ld in base it seems to be safe to remove that flag.

Discussed with:	tijl

Mk/Uses/fortran.mk

@@ -28,7 +28,7 @@ FFLAGS+=	-Wl,-rpath=${LOCALBASE}/lib/gcc${_GCC_VER}
 F90FLAGS+=	-Wl,-rpath=${LOCALBASE}/lib/gcc${_GCC_VER}
 FCFLAGS+=	-Wl,-rpath=${LOCALBASE}/lib/gcc${_GCC_VER}
 LDFLAGS+=	-Wl,-rpath=${LOCALBASE}/lib/gcc${_GCC_VER} \
-		-L${LOCALBASE}/lib/gcc${_GCC_VER} -B${LOCALBASE}/bin
+		-L${LOCALBASE}/lib/gcc${_GCC_VER}
 .  else
 IGNORE=		USES=fortran: invalid arguments: ${fortran_ARGS}
 .  endif