package/ci: temporarily disable macOS, iOS, ARM and Android ES2 builds.

I'm running out of the 400k free monthly credits and since macOS takes
50 credits per minute vs 5 for the Linux Docker, it's the obvious
candidate. ARM and Android take 10 instead of 5 and since we don't have
any ARM-specific code and the Android ES3 build doesn't run GL tests,
it's also non-essential.

Will revert this at the start of Junly.

package/ci/circleci.yml

@@ -616,7 +616,7 @@ workflows:
   build:
     jobs:
     - linux-gl
-    - linux-arm64
+    #- linux-arm64
     - linux-vulkan
     - linux-gles2
     - linux-gles3
@@ -624,13 +624,13 @@ workflows:
     - linux-nondeprecated
     - linux-sanitizers
     - linux-threadsanitizer
-    - macos-gl
-    - macos-vulkan
-    - macos-gles3
-    - macos-static
+    #- macos-gl
+    #- macos-vulkan
+    #- macos-gles3
+    #- macos-static
     - emscripten-webgl1
     - emscripten-webgl2
     - android-x86-gles2
-    - android-x86-gles3
+    #- android-x86-gles3
     - android-x86-vulkan
-    - ios-gles3
+    #- ios-gles3