xbps-src: create a cc/g++ wrapper to drop -I/usr/include -L/usr/lib in cross.

I'm tired of wasting extra time to fix software to remove standard include/lib dirs.

common/hooks/pre-configure/02-script-wrapper.sh

@@ -88,6 +88,23 @@ install_wrappers() {
 	done
 }
 
+install_cross_wrappers() {
+	local fname
+
+	for fname in cc gcc; do
+		sed -e "s,@BIN@,/usr/bin/$XBPS_CROSS_TRIPLET-gcc,g" \
+			${XBPS_COMMONDIR}/wrappers/cc > \
+			${XBPS_WRAPPERDIR}/${XBPS_CROSS_TRIPLET}-${fname}
+		chmod 755 ${XBPS_WRAPPERDIR}/${XBPS_CROSS_TRIPLET}-${fname}
+	done
+	for fname in c++ g++; do
+		sed -e "s,@BIN@,/usr/bin/$XBPS_CROSS_TRIPLET-g++,g" \
+			${XBPS_COMMONDIR}/wrappers/cc > \
+			${XBPS_WRAPPERDIR}/${XBPS_CROSS_TRIPLET}-${fname}
+		chmod 755 ${XBPS_WRAPPERDIR}/${XBPS_CROSS_TRIPLET}-${fname}
+	done
+}
+
 hook() {
 	export PATH="$XBPS_WRAPPERDIR:$PATH"
 
@@ -95,6 +112,7 @@ hook() {
 
 	[ -z "$CROSS_BUILD" ] && return 0
 
+	install_cross_wrappers
 	pkgconfig_wrapper
 	generic_wrapper icu-config
 	generic_wrapper libgcrypt-config

common/wrappers/cc

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# compiler wrapper to get rid of -I/usr/include and -L/usr/lib, that fucks up
+# cross compilation badly.
+MYARGS=
+
+for i in $@; do
+	if [ $i = "-L/usr/lib" -o $i = "-I/usr/include" ]; then
+		continue
+	else
+		MYARGS+="$i "
+	fi
+done
+exec @BIN@ ${MYARGS}