Travis: Temporarily disable macOS builds

Travis CI has had trouble the past few days and macOS builds error out
for no reason.

.travis.yml

@@ -67,17 +67,17 @@ matrix:
 #          packages:
 #            - openjdk-8-jdk
 
-    - name: macOS editor (debug, Clang)
+#    - name: macOS editor (debug, Clang)
-      stage: build
+#      stage: build
-      env: PLATFORM=osx TOOLS=yes TARGET=debug CACHE_NAME=${PLATFORM}-tools-clang EXTRA_ARGS="warnings=extra werror=yes"
+#      env: PLATFORM=osx TOOLS=yes TARGET=debug CACHE_NAME=${PLATFORM}-tools-clang EXTRA_ARGS="warnings=extra werror=yes"
-      os: osx
+#      os: osx
-      osx_image: xcode11.3
+#      osx_image: xcode11.3
-      compiler: clang
+#      compiler: clang
-      addons:
+#      addons:
-        homebrew:
+#        homebrew:
-          packages:
+#          packages:
-            - scons
+#            - scons
-          update: true
+#          update: true
 
 # TODO: iOS MoltenVK support