Disable broken CI platforms. (#469) (#470)

(cherry picked from commit f7bc3aa77c)

Co-authored-by: Felix Fontein <felix@fontein.de>

.azure-pipelines/azure-pipelines.yml

@@ -219,8 +219,8 @@ stages:
         parameters:
           testFormat: 2.12/{0}/1
           targets:
-            - name: macOS 11.1
-              test: macos/11.1
+            # - name: macOS 11.1
+            #   test: macos/11.1
             - name: RHEL 8.4
               test: rhel/8.4
             - name: FreeBSD 13.0
@@ -249,8 +249,8 @@ stages:
           targets:
             - name: OS X 10.11
               test: osx/10.11
-            - name: macOS 10.15
-              test: macos/10.15
+            # - name: macOS 10.15
+            #   test: macos/10.15
   - stage: Remote_2_9
     displayName: Remote 2.9
     dependsOn: []