Deal with ccache being set inside if

compile_fw

@@ -295,8 +295,8 @@ set_ccache() {
 	[ -z "$CCACHE_SET" ] || return 0
 	_report "Setting ccache paths"
 	CCACHE_SET=y
-	[ -z "$CCACHE_HOST_DIR" ] || sed -i 's|\(export CCACHE_DIR:=\).*|\1'"$CCACHE_HOST_DIR|" include/host-build.mk
-	[ -z "$CCACHE_TARGET_DIR" ] || [ -z "$TARGET_ARCH" ] || sed -i 's|\(export CCACHE_DIR:=\).*|\1'"$CCACHE_TARGET_DIR/$TARGET_ARCH|" include/package.mk
+	[ -z "$CCACHE_HOST_DIR" ] || sed -i 's|\(export CCACHE_DIR:=\)[^),]*|\1'"$CCACHE_HOST_DIR|" include/host-build.mk
+	[ -z "$CCACHE_TARGET_DIR" ] || [ -z "$TARGET_ARCH" ] || sed -i 's|\(export CCACHE_DIR:=\)[^),]*|\1'"$CCACHE_TARGET_DIR/$TARGET_ARCH)|" include/package.mk
 	[ -z "$(git diff include/host-build.mk include/package.mk)" ] || git commit -m "include: ccache settings" include/host-build.mk include/package.mk
 }