toolchain/ports: Use strip install targets

I just found that these exist. This is much cleaner than manually
stripping the executables!

ports/binutils/build.sh

@@ -4,6 +4,7 @@ NAME='binutils'
 VERSION='2.44'
 DOWNLOAD_URL="https://ftp.gnu.org/gnu/binutils/binutils-$VERSION.tar.gz#0cdd76777a0dfd3dd3a63f215f030208ddb91c2361d2bcc02acec0f1c16b6a2e"
 DEPENDENCIES=('zlib')
+MAKE_INSTALL_TARGETS=('install-strip')
 CONFIGURE_OPTIONS=(
 	"--target=$BANAN_TOOLCHAIN_TRIPLE"
 	'--with-sysroot=/'
@@ -14,8 +15,3 @@ CONFIGURE_OPTIONS=(
 	'--disable-nls'
 	'--disable-werror'
 )
-
-build() {
-	make -j$(nproc) || exit 1
-	find . -type f -executable -exec $STRIP --strip-unneeded {} + 2>/dev/null
-}