Fixed ZTS cache usage

Author: dstogov

ext/ffi/config.m4

@@ -55,6 +55,6 @@ if test "$PHP_FFI" != "no"; then
     -L$FFI_LIBDIR
   ])
 
-  PHP_NEW_EXTENSION(ffi, ffi.c ffi_parser.c, $ext_shared)
+  PHP_NEW_EXTENSION(ffi, ffi.c ffi_parser.c, $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
   PHP_SUBST(FFI_SHARED_LIBADD)
 fi