file.c: remove unnecessary declaration

* file.c (GetLastError): already defined in windows.h on nowadays
  cygwin, and caused the confliction with the system provided
  definition on cygwin64.  by @kou1okada [Fixes GH-433].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43583 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 0 insertions, 1 deletions

diff --git a/file.c b/file.c
index 8b74369d21..b14f42e1f8 100644
--- a/file.c
+++ b/file.c
@@ -4302,7 +4302,6 @@ rb_file_truncate(VALUE obj, VALUE len)
 
 #ifdef __CYGWIN__
 #include <winerror.h>
-extern unsigned long __attribute__((stdcall)) GetLastError(void);
 #endif
 
 static VALUE