travis: osx default to 10.14 / xcode 11.3

(also no brew update to speed up builds)

.travis.yml

@@ -35,7 +35,6 @@ addons:
     packages:
     - re2c
     - p7zip
-    update: true
 
 install:
   - python cue.py prepare
@@ -84,6 +83,7 @@ jobs:
 
   - env: SET=test00
     os: osx
+    osx_image: xcode11.3
     install: python cue-test.py env
     script: python cue-test.py
 
@@ -122,6 +122,7 @@ jobs:
     compiler: clang
 
   - os: osx
+    osx_image: xcode11.3
     env:
       - SET=test01
       - EXTRA=CMD_CFLAGS="-mmacosx-version-min=10.7"
@@ -131,6 +132,7 @@ jobs:
 
   - env: SET=test01 BCFG=debug
     os: osx
+    osx_image: xcode11.3
     compiler: clang
 
   - env: SET=test01 WINE=32 TEST=NO

travis/.travis.yml.example-full

@@ -39,7 +39,6 @@ addons:
     - re2c
     # for .zip/.7z archive hooks
     - p7zip
-    update: true
 
 install:
   - python .ci/cue.py prepare
@@ -122,6 +121,7 @@ jobs:
 
   - env: BASE=7.0
     os: osx
+    osx_image: xcode11.3
     compiler: clang
 
 # Windows builds