Fix Cygwin compilation after target_ops C++ conversion.

After f6ac5f3d "Convert struct target_ops to C++", we need to explicitly use
the global namespace when calling ::close() from windows_nat_target methods,
as that object has a close() method.

gdb/ChangeLog:

2018-07-14  Jon Turney  <jon.turney@dronecode.org.uk>

	* windows-nat.c (windows_nat_target::create_inferior): Update to
	call close() in global namespace.

1 files changed, 4 insertions, 4 deletions

diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index e0e422c0f05..aea502638e0 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -2681,13 +2681,13 @@ windows_nat_target::create_inferior (const char *exec_file,
 
   if (tty >= 0)
     {
-      close (tty);
+      ::close (tty);
       dup2 (ostdin, 0);
       dup2 (ostdout, 1);
       dup2 (ostderr, 2);
-      close (ostdin);
-      close (ostdout);
-      close (ostderr);
+      ::close (ostdin);
+      ::close (ostdout);
+      ::close (ostderr);
     }
 #else  /* !__CYGWIN__ */
   allargs_len = strlen (allargs);