Revert "Drop -Werror on CI"

This reverts commit c059831.

Author: Girgias

azure/configure.yml

@@ -61,6 +61,7 @@ steps:
         --with-imap \
         --with-kerberos \
         --with-imap-ssl \
+        --enable-werror \
         --with-config-file-path=/etc \
         --with-config-file-scan-dir=/etc/php.d
   displayName: 'Configure Build'

azure/i386/job.yml

@@ -65,6 +65,7 @@ jobs:
             --with-mhash \
             --with-sodium \
             --enable-dba \
+            --enable-werror \
             --with-config-file-path=/etc \
             --with-config-file-scan-dir=/etc/php.d
       displayName: 'Configure Build'

travis/compile.sh

@@ -68,6 +68,7 @@ $S390X_CONFIG \
 --with-ffi \
 --with-sodium \
 --enable-zend-test=shared \
+--enable-werror \
 --with-pear
 
 if [[ -z "$CONFIG_ONLY" ]]; then