[libxml2] Remove remaining definitions of STDC_HEADERS

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 02709d0f673b79568573af9ba685b050db8dc209
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Wed Apr 20 19:18:17 2022 +0200

    Remove remaining definitions of STDC_HEADERS
    
    Sync with Autotools build.

 CMakeLists.txt         | 1 -
 config.h.cmake.in      | 3 ---
 os400/os400config.h.in | 3 ---
 vms/config.vms         | 3 ---
 4 files changed, 10 deletions(-)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b85456b..5046824d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -204,7 +204,6 @@ if (NOT MSVC)
        else()
                set(SEND_ARG2_CAST "/**/")
        endif()
-       check_include_files("float.h;stdarg.h;stdlib.h;string.h" STDC_HEADERS)
        check_c_source_compiles("
                #include <stdarg.h>
                void a(va_list* ap) {};
diff --git a/config.h.cmake.in b/config.h.cmake.in
index 5af19f9a..1f8be710 100644
--- a/config.h.cmake.in
+++ b/config.h.cmake.in
@@ -150,9 +150,6 @@
 /* Type cast for the send() function 2nd arg */
 #cmakedefine SEND_ARG2_CAST @SEND_ARG2_CAST@
 
-/* Define to 1 if you have the ANSI C header files. */
-#cmakedefine STDC_HEADERS 1
-
 /* Support for IPv6 */
 #cmakedefine SUPPORT_IP6 1
 
diff --git a/os400/os400config.h.in b/os400/os400config.h.in
index 479486e2..785cd7f6 100644
--- a/os400/os400config.h.in
+++ b/os400/os400config.h.in
@@ -144,9 +144,6 @@
 /* Define to the version of this package. */
 #define PACKAGE_VERSION         ""
 
-/* Define to 1 if you have the ANSI C header files. */
-#define STDC_HEADERS            1
-
 /* Support for IPv6 */
 #define SUPPORT_IP6
 
diff --git a/vms/config.vms b/vms/config.vms
index 1ba9df88..b55ce0ea 100755
--- a/vms/config.vms
+++ b/vms/config.vms
@@ -2,9 +2,6 @@
 
 #define VMS    1
 
-/* Define if you have the ANSI C header files.  */
-#define STDC_HEADERS   1
-
 #undef PACKAGE
 #undef VERSION
 #undef HAVE_LIBM