win32: fix redefine symbol

PJ_SIP defines WIN32_LEAN_AND_MEAN since 3876.
If we not force it to 1, this causes lot of redefinition
warning at build.

Change-Id: If72f0260bf15ce002cd922b875a0e816c6eb3ea2
Tuleap: #487

configure.ac

@@ -74,7 +74,7 @@ case "${host_os}" in
     AC_DEFINE([_BSD_SOURCE], [1], [ISO C, POSIX, and 4.3BSD things.])
     AC_DEFINE([_SVID_SOURCE], [1], [ISO C, POSIX, and SVID things.])
 
-    AC_DEFINE([WIN32_LEAN_AND_MEAN],, [Define to limit the scope of <windows.h>.])
+    AC_DEFINE([WIN32_LEAN_AND_MEAN],[1], [Define to limit the scope of <windows.h>.])
 
     CPPFLAGS+="-D_WIN32_WINNT=0x0601 -DWINVER=0x0601 -D__USE_MINGW_ANSI_STDIO=1"
     LDFLAGS+="-no-undefined -avoid-version -Wl,--nxcompat -Wl,--dynamicbase"

src/winsyslog.h

@@ -13,7 +13,9 @@
 
 #ifndef WINSYSLOG_H
 #define WINSYSLOG_H
-#define WIN32_LEAN_AND_MEAN
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN 1
+#endif
 #include <windows.h>
 
 #define WINLOG_PRIMASK  0x07