MFH: fixed bug #42502 va_* cannot detect.

ext/mbstring/config.m4

@@ -87,7 +87,7 @@ esac
 )
     ])
 
-    AC_CHECK_HEADERS([stdlib.h string.h strings.h unistd.h sys/time.h sys/times.h])
+    AC_CHECK_HEADERS([stdlib.h string.h strings.h unistd.h sys/time.h sys/times.h stdarg.h])
     AC_CHECK_SIZEOF(int, 4)
     AC_CHECK_SIZEOF(short, 2)
     AC_CHECK_SIZEOF(long, 4)
@@ -96,9 +96,6 @@ esac
     AC_FUNC_ALLOCA
     AC_FUNC_MEMCMP
 
-    if test "$cv_php_mbstring_stdarg" = "yes"; then
-      AC_DEFINE([HAVE_STDARG_PROTOTYPES], 1, [Define if stdarg.h is available])
-    fi
     AC_DEFINE([HAVE_MBREGEX], 1, [whether to have multibyte regex support])
 
 

ext/mbstring/oniguruma/php_onig_compat.h

@@ -5,4 +5,10 @@
 #define regex_t                     php_mb_regex_t
 #define re_registers                php_mb_re_registers
 
+#ifdef HAVE_STDARG_H
+#ifndef HAVE_STDARG_PROTOTYPES
+#define HAVE_STDARG_PROTOTYPES 1
+#endif
+#endif
+
 #endif /* _PHP_MBREGEX_COMPAT_H */