Fix bug #63595 GMP memory management conflicts with other libraries using GMP

Drop use of php memory allocators as this raise various conflicts
with other extensions and libraries which use libgmp.

No other solution found.
We cannot for ensure correct use of allocator with shared lib.

Some memory can allocated before php init
Some memory can be freed after php shutdown

Known broken run cases
- php + curl + gnutls + gmp
- mod_gnutls + mod_php + gnutls + gmp
- php + freetds + gnutls + gmp
- php + odbc + freetds + gnutls + gmp
- php + php-mapi (zarafa) + gnutls + gmp

Author: remicollet

ext/gmp/gmp.c

@@ -324,30 +324,6 @@ static void _php_gmpnum_free(zend_rsrc_list_entry *rsrc TSRMLS_DC);
 #	define MAX_BASE 36
 #endif
 
-/* {{{ gmp_emalloc
- */
-static void *gmp_emalloc(size_t size)
-{
-	return emalloc(size);
-}
-/* }}} */
-
-/* {{{ gmp_erealloc
- */
-static void *gmp_erealloc(void *ptr, size_t old_size, size_t new_size)
-{
-	return erealloc(ptr, new_size);
-}
-/* }}} */
-
-/* {{{ gmp_efree
- */
-static void gmp_efree(void *ptr, size_t size)
-{
-	efree(ptr);
-}
-/* }}} */
-
 /* {{{ ZEND_GINIT_FUNCTION
  */
 static ZEND_GINIT_FUNCTION(gmp)
@@ -369,8 +345,6 @@ ZEND_MODULE_STARTUP_D(gmp)
 #endif
 	REGISTER_STRING_CONSTANT("GMP_VERSION", (char *)gmp_version, CONST_CS | CONST_PERSISTENT);
 
-	mp_set_memory_functions(gmp_emalloc, gmp_erealloc, gmp_efree);
-
 	return SUCCESS;
 }
 /* }}} */