linux-tools: correct the functional detection

They're build as part of tools/build.
fixdep will be built by HOSTCC anyway.

srcpkgs/linux-tools/template

@@ -48,7 +48,6 @@ post_extract() {
 pre_configure() {
 	echo "#define PERF_VERSION \"${version}_${revision}\"" \
 		>tools/perf/PERF-VERSION-FILE
-	vsed -i 's/usbip_bind_driver.8//' tools/usb/usbip/Makefile.am
 }
 
 do_build() {
@@ -65,9 +64,9 @@ do_build() {
 	esac
 
 	make -C tools/build V=1 \
-		CC=$CC_FOR_BUILD LD=$LD_FOR_BUILD \
-		CFLAGS="$CFLAGS_FOR_BUILD" EXTRA_CFLAGS="$CFLAGS_FOR_BUILD" \
-		LDFLAGS="$LDFLAGS_FOR_BUILD" \
+		CC=$CC LD=$LD \
+		CFLAGS="$CFLAGS" EXTRA_CFLAGS="$CFLAGS" \
+		LDFLAGS="$LDFLAGS" \
 		WERROR=0 NO_GTK2=1 NO_SDT=1 PYTHON=python3
 
 	make -C tools/perf ${makejobs} V=1 ARCH=$arch \