fix building by bcc broken in r2143

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 07f27df..11b266f 100644
--- a/src/os/win32/ngx_win32_config.h
+++ b/src/os/win32/ngx_win32_config.h
@@ -112,6 +112,7 @@
 typedef __int32             int32_t;
 typedef unsigned __int16    uint16_t;
 #define ngx_libc_cdecl      __cdecl
+#define _strnicmp           strnicmp
 
 #else /* __WATCOMC__ */
 typedef unsigned int        uint32_t;