Drop FASTCALL on variadic functions

This is unlikely to be properly supported by compilers anyway, see
<php#2975>.

Author: cmb69

Zend/zend_ast.c

@@ -290,15 +290,15 @@ ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_va(
 	return ast;
 }
 
-ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_n(unsigned kind, ...) {
+ZEND_API zend_ast * zend_ast_create_n(unsigned kind, ...) {
 	va_list va;
 	va_start(va, kind);
 	zend_ast *ast = zend_ast_create_va(kind, 0, &va);
 	va_end(va);
 	return ast;
 }
 
-ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_ex_n(
+ZEND_API zend_ast * zend_ast_create_ex_n(
 		zend_ast_kind kind, unsigned attr, ...) {
 	va_list va;
 	va_start(va, attr);

Zend/zend_ast.h

@@ -249,8 +249,8 @@ ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_5(zend_ast_kind kind, zend_ast
 
 ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_va(zend_ast_kind kind, zend_ast_attr attr, va_list *va);
 /* Need to use unsigned args to avoid va promotion UB. */
-ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_n(unsigned kind, ...);
-ZEND_API zend_ast * ZEND_FASTCALL zend_ast_create_ex_n(zend_ast_kind kind, unsigned attr, ...);
+ZEND_API zend_ast * zend_ast_create_n(unsigned kind, ...);
+ZEND_API zend_ast * zend_ast_create_ex_n(zend_ast_kind kind, unsigned attr, ...);
 
 static zend_always_inline zend_ast * zend_ast_create_ex_0(zend_ast_kind kind, zend_ast_attr attr) {
 	zend_ast *ast = zend_ast_create_0(kind);