CI:mac: Set CMAKE_INSTALL_NAME_DIR

CMake defaults to using rpath-based installs, but doesn't set rpath to include the deps dir when building, breaking Qt builds when they try to invoke rcc (which links against zstd) from the build dir

.github/workflows/scripts/macos/build-dependencies.sh

@@ -36,6 +36,7 @@ CMAKE_COMMON=(
 	-DCMAKE_PREFIX_PATH="$INSTALLDIR"
 	-DCMAKE_INSTALL_PREFIX="$INSTALLDIR"
 	-DCMAKE_OSX_ARCHITECTURES="x86_64"
+	-DCMAKE_INSTALL_NAME_DIR='$<INSTALL_PREFIX>/lib'
 )
 
 cat > SHASUMS <<EOF