Fix compilation with older environments

This change should fix following compile error:

    dlfcn.c: In function 'dlsym':
    dlfcn.c:374:14: warning: implicit declaration of function 'GetModuleHandleExA'
    dlfcn.c: undefined reference to `GetModuleHandleExA'

Documentation for function GetModuleHandleExA() says:

    To compile an application that uses this function, define _WIN32_WINNT as 0x0501 or later.

Fixes: https://github.com/dlfcn-win32/dlfcn-win32/issues/75

1 files changed, 3 insertions, 0 deletions

diff --git a/dlfcn.c b/dlfcn.c
index a45a619..6f5da80 100644
--- a/dlfcn.c
+++ b/dlfcn.c
@@ -19,6 +19,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 

+#ifndef _WIN32_WINNT

+#define _WIN32_WINNT 0x0501

+#endif

 #ifdef _DEBUG

 #define _CRTDBG_MAP_ALLOC

 #include <stdlib.h>