Fix GH-12297: PHP Startup: Invalid library (maybe not a PHP library) 'mysqlnd.so' in Unknown on line

On some configurations, the COMPILE_DL_MYSQLND must come from config.h.
If it isn't set, the get_module function won't be exposed, resulting in
a failure when trying to load the library.
It's the same issue ext/fileinfo had a while back that was fixed in
b0ba368d5.

Closes GH-12299.

NEWS

@@ -22,6 +22,10 @@ PHP                                                                        NEWS
   . Fixed bug GH-12282 (IntlDateFormatter::construct should throw an exception
     on an invalid locale). (David Carlier)
 
+- MySQLnd:
+  . Fixed bug GH-12297 (PHP Startup: Invalid library (maybe not a PHP library)
+    'mysqlnd.so' in Unknown on line). (nielsdos)
+
 - PCRE:
   . Fixed bug GH-11956 (Backport upstream fix, PCRE regular expressions with
     JIT enabled gives different result). (nielsdos)

ext/mysqlnd/php_mysqlnd.c

@@ -15,6 +15,9 @@
   +----------------------------------------------------------------------+
 */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
 #include "php.h"
 #include "mysqlnd.h"
 #include "mysqlnd_priv.h"