Cross compiling improvements + macOS universal binary (#1458)

* chore(resources): rename macos_arm64.txt to macos-arm64.txt
   This matches the platform-arch convention like many other parts of the project.
* chore(resources/cross): rename wasm.txt to unknown-wasm32.txt
* refactor(scripts/common.sh): use parameter expansion instead of if else
* feat(scripts/common.sh): support custom arch and platform for get_default_build_dir
* feat(scripts/build.sh): add --cross-platform, --cross-arch and --cross-file
* feat(scripts/package.sh): add --cross-platform and --cross-arch
* feat(build-packages.sh): add support for new options in build.sh and packages.sh
* ci(build): make arm64 binaries in CI
* ci(build): do not install external libraries
* ci(build): fix invalid artifact name
* ci(build): fix INSTALL_NAME
* ci(build): change name for macos artifacts
* ci(build): add script to build universal dmgs from individual dmgs
* ci(build): build universal dmgs
* fix(make-universal-binaries): fix wrong path for hdiutil
* ci(build): rename macos action
* fix(make-universal-binaries.sh): fix wrong pathname for ditto
* ci(release): build macos universal binaries
* ci(release): remove useless variables
* ci(release): fix wrong dependency
* ci(build): fix old ubuntu version
   This version will be restored once I complete some container-specific fixes.
* ci(build): make build_macos_universal depend on release
* ci(build): fix wrong dmg dir
* style(ci): capitalize 'universal' for CI name
* fix(make-universal-binaries.sh): fix truncated dmg name when it contains dots
* ci: styling changes
* ci(release): install appdmg only

scripts/common.sh

@@ -75,22 +75,20 @@ get_platform_name() {
 
 get_platform_arch() {
   platform=$(get_platform_name)
-  arch=$(uname -m)
+  arch=${CROSS_ARCH:-$(uname -m)}
   if [[ $MSYSTEM != "" ]]; then
     if [[ $MSYSTEM == "MINGW64" ]]; then
       arch=x86_64
     else
       arch=i686
     fi
-  elif [[ $CROSS_ARCH != "" ]]; then
-    arch=$CROSS_ARCH
   fi
   echo "$arch"
 }
 
 get_default_build_dir() {
-  platform=$(get_platform_name)
-  arch=$(get_platform_arch)
+  platform="${1:-$(get_platform_name)}"
+  arch="${2:-$(get_platform_arch)}"
   echo "build-$platform-$arch"
 }