enable getenv() and gmtime() in msvc8

src/os/win32/ngx_win32_config.h

diff --git a/src/os/win32/ngx_win32_config.h b/src/os/win32/ngx_win32_config.h
index 9dc8ca8..07f27df 100644
--- a/src/os/win32/ngx_win32_config.h
+++ b/src/os/win32/ngx_win32_config.h
@@ -15,6 +15,9 @@
 #define STRICT
 #define WIN32_LEAN_AND_MEAN
 
+/* enable getenv() and gmtime() in msvc8 */
+#define _CRT_SECURE_NO_WARNINGS
+
 /*
  * we need to include <windows.h> explicity before <winsock2.h> because
  * the warning 4201 is enabled in <windows.h>