Use -L to specify compat32 library paths instead of -Y

-Y is an uncommon linker option that is rather similar to -L.  In
discussion with Peter it seems early amd64 development might have
required the -Y-specific behaviour, but it is no longer necessary.

Switch to -L which is more widely supported and much more commonly
used, to make it easier to link the FreeBSD base system with linkers
other than ld.bfd.

Submitted by:	Rafael Ávila de Espíndola
Differential Revision:	https://reviews.freebsd.org/D6681

Makefile.libcompat

@@ -19,7 +19,7 @@ LIB32WMAKEENV=	MACHINE=i386 MACHINE_ARCH=i386 \
 		MACHINE_CPU="i686 mmx sse sse2"
 LIB32WMAKEFLAGS=	\
 		AS="${XAS} --32" \
-		LD="${XLD} -m elf_i386_fbsd -Y P,${LIBCOMPATTMP}/usr/lib32" \
+		LD="${XLD} -m elf_i386_fbsd -L${LIBCOMPATTMP}/usr/lib32" \
 		OBJCOPY="${XOBJCOPY}"
 
 .elif ${TARGET_ARCH} == "powerpc64"