PHPC-632: Define MONGOC_NO_AUTOMATIC_GLOBALS when bundling libmongoc

This ensures that libmongoc's automatic destructor is disabled and will avoid segfaults during abrupt FPM shutdowns for static builds.

Those using the driver with system libmongoc will need to wait for CDRIVER-1160 to be released in order to resolve this issue.

Fixes #209, fixes #258

Author: jmikola

config.m4

@@ -357,7 +357,7 @@ PHP_ARG_WITH(libmongoc, whether to use system libmongoc,
     PHP_EVAL_LIBLINE($LIBMONGOC_LIB, MONGODB_SHARED_LIBADD)
     AC_DEFINE(HAVE_SYSTEM_LIBMONGOC, 1, [Use system libmongoc])
   else
-    CPPFLAGS="$CPPFLAGS -DBSON_COMPILATION -DMONGOC_COMPILATION -DMONGOC_TRACE"
+    CPPFLAGS="$CPPFLAGS -DBSON_COMPILATION -DMONGOC_COMPILATION -DMONGOC_TRACE -DMONGOC_NO_AUTOMATIC_GLOBALS"
 
     PHP_ADD_SOURCES_X(PHP_EXT_DIR(mongodb)[src/libmongoc/src/mongoc], $MONGOC_SOURCES,      [$STD_CFLAGS], shared_objects_mongodb, yes)
     PHP_ADD_SOURCES_X(PHP_EXT_DIR(mongodb)[src/libmongoc/src/mongoc], $MONGOC_SOURCES_SSL,  [$STD_CFLAGS], shared_objects_mongodb, yes)