include what you use: errno.h in exec_process.cc

tools/gn/exec_process.cc

Index: tools/gn/exec_process.cc
diff --git a/tools/gn/exec_process.cc b/tools/gn/exec_process.cc
index e15f595d1541c5a424e975e72ac89880279eb032..612399149e57d8a20aa7dd0fd8f1e63df5f1d195 100644
--- a/tools/gn/exec_process.cc
+++ b/tools/gn/exec_process.cc
@@ -14,6 +14,8 @@
 
 #include "base/win/scoped_handle.h"
 #include "base/win/scoped_process_information.h"
+#else
+#include <errno.h>

[tfarina, 2015/11/07 16:10:56]

Maybe do this in the POSIX case below?

[Mostyn Bramley-Moore, 2015/11/07 19:52:39]

In this file errno is only used inside the else block of an OS_WIN condition, so
I think this is possibly (very) slightly more accurate.  But this is personal
preference, really.  

Maybe we should just include errno.h unconditionally- I believe this is safe.

[tfarina, 2015/11/08 13:59:33]

Then should we move the includes below in this else instead?

[Mostyn Bramley-Moore, 2015/11/09 16:40:07]

I will defer to Brett on this.

[brettw, 2015/11/10 21:48:19]

Personally I'd merge them all into the else.

[Mostyn Bramley-Moore, 2015/11/10 22:24:22]

Done.

 #endif
 
 #if defined(OS_POSIX)