Add -Wno-missing-field-initializers to silence bogus warnings from GCC in maintainer mode.

cmake/maintainer.cmake

@@ -19,6 +19,15 @@ INCLUDE(CheckCCompilerFlag)
 MACRO(SET_MYSQL_MAINTAINER_GNU_C_OPTIONS)
   SET(MY_MAINTAINER_WARNINGS
       "-Wall -Wextra -Wunused -Wwrite-strings -Wno-strict-aliasing")
+
+  CHECK_C_COMPILER_FLAG("-Wno-missing-field-initializers"
+    HAVE_NO_MISSING_FIELD_INITIALIZERS)
+
+  IF (HAVE_NO_MISSING_FIELD_INITIALIZERS)
+    SET(MY_MAINTAINER_WARNINGS
+      "${MY_MAINTAINER_WARNINGS} -Wno-missing-field-initializers")
+  ENDIF()
+
   CHECK_C_COMPILER_FLAG("-Wdeclaration-after-statement"
                         HAVE_DECLARATION_AFTER_STATEMENT)
   IF(HAVE_DECLARATION_AFTER_STATEMENT)