chroot-gcc: fix cross builds to not set default cross sysroot.

srcpkgs/chroot-gcc/template

@@ -7,7 +7,7 @@ _mpc_ver=0.8.2
 
 pkgname=chroot-gcc
 version=${_majorver}.3
-revision=1
+revision=2
 wrksrc="gcc-${version}"
 homepage="http://gcc.gnu.org"
 short_desc="The GNU C Compiler suite -- for xbps-src use"
@@ -105,6 +105,10 @@ _mpc_build() {
 do_configure() {
 	local _floatabi _args
 
+	if [ "$CROSS_BUILD" ]; then
+		_args="--host=$XBPS_CROSS_TRIPLET"
+	fi
+
 	if [ "$XBPS_TARGET_MACHINE" = "armv6l" ]; then
 		_floatabi="--with-float=hard"
 	elif [ "$XBPS_TARGET_MACHINE" = "i686" ]; then
@@ -132,7 +136,8 @@ do_configure() {
 	cd gcc-build
 
 	CONFIG_SHELL=/bin/bash \
-		../gcc-${version}/configure ${CONFIGURE_SHARED_ARGS} \
+		../gcc-${version}/configure --prefix=/usr \
+		--mandir=/usr/share/man --infodir=/usr/share/info \
 		--libdir=/usr/lib --libexecdir=/usr/lib \
 		--enable-clocale=gnu --enable-shared \
 		--enable-threads=posix --enable-__cxa_atexit \
@@ -145,7 +150,7 @@ do_configure() {
 		--without-cloog --without-ppl --disable-libstdcxx-pch \
 		--disable-libquadmath --disable-libquadmath-support \
 		--disable-libgomp --disable-libssp --disable-libitm \
-		${_floatabi}
+		${_args} ${_floatabi}
 }
 
 do_build() {