Move -L${LIBCOMPATTMP}/usr/lib${libcompat} from CFLAGS to LDFLAGS.

This is only needed when linking and fixes various "unused command
line argument" warnings during the lib32 build.

Reviewed by:	bdrewery
Obtained from:	CheriBSD
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D26068

share/mk/bsd.compat.mk

@@ -38,7 +38,7 @@ LIB32_MACHINE_ARCH=	i386
 LIB32WMAKEENV=	MACHINE_CPU="i686 mmx sse sse2"
 LIB32WMAKEFLAGS=	\
 		AS="${XAS} --32" \
-		LD="${XLD} -m elf_i386_fbsd -L${LIBCOMPATTMP}/usr/lib32"
+		LD="${XLD} -m elf_i386_fbsd"
 
 .elif ${COMPAT_ARCH} == "powerpc64"
 HAS_COMPAT=32
@@ -146,10 +146,11 @@ LIBCOMPAT_OBJTOP?=	${OBJTOP}/obj-lib${libcompat}
 LIBCOMPATTMP?=		${LIBCOMPAT_OBJTOP}/tmp
 
 LIBCOMPATCFLAGS+=	${LIBCOMPATCPUFLAGS} \
-			-L${LIBCOMPATTMP}/usr/lib${libcompat} \
 			--sysroot=${LIBCOMPATTMP} \
 			${BFLAGS}
 
+LIBCOMPATLDFLAGS+=	-L${LIBCOMPATTMP}/usr/lib${libcompat}
+
 LIBCOMPATWMAKEENV+=	MACHINE=${LIBCOMPAT_MACHINE}
 LIBCOMPATWMAKEENV+=	MACHINE_ARCH=${LIBCOMPAT_MACHINE_ARCH}