fix: force set toolchain version for macOS 26

Author: udmada

build-libvpx

@@ -10,7 +10,7 @@ pkgname="libvpx"
 pkgdir="${STOWDIR}/${pkgname}"
 srcdir="src/libvpx"
 
-target="$(uname -m)-darwin$(uname -r | cut -d . -f 1)-gcc"
+target="$(uname -m)-darwin24-gcc"
 
 echo
 echo "*** $0: started"