Remove HAVE_STDARG_H

The C89 standard and later defines the `<stdarg.h>` header as part of
the standard headers [1]. On current systems it is always present and
can be included unconditionally.

Checking for presence and functionality of the `<stdarg.h>` header and
variadic function is not relevant anymore on current systems since this
is always available.

Also Autoconf suggests relying on at least C89 or above [2] and [3].

The following files were regenerated with re2c 1.0.3:
- Zend/zend_language_scanner.c
- Zend/zend_language_scanner_defs.h

Refs:
[1] https://port70.net/~nsz/c/c89/c89-draft.html#4.1.2
[2] http://git.savannah.gnu.org/cgit/autoconf.git/tree/lib/autoconf/headers.m4
[3] https://www.gnu.org/software/autoconf/manual/autoconf-2.69/autoconf.html

1 files changed, 0 insertions, 3 deletions

diff --git a/TSRM/TSRM.c b/TSRM/TSRM.c
index 9451ed1731..74ef25b50c 100644
--- a/TSRM/TSRM.c
+++ b/TSRM/TSRM.c
@@ -15,10 +15,7 @@
 #ifdef ZTS
 
 #include <stdio.h>
-
-#if HAVE_STDARG_H
 #include <stdarg.h>
-#endif
 
 typedef struct _tsrm_tls_entry tsrm_tls_entry;