[newlib-cygwin] Cygwin: fix GCC 8.3 'local external declaration' errors

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=3a956a9bc3275f9052c5d97d4955f10341b1277c

commit 3a956a9bc3275f9052c5d97d4955f10341b1277c
Author: Ken Brown <kbrown@cornell.edu>
Date:   Mon Jul 15 17:11:02 2019 -0400

    Cygwin: fix GCC 8.3 'local external declaration' errors
    
    Move external declarations out of function definition.

Diff:
---
 winsup/cygserver/bsd_mutex.cc | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/winsup/cygserver/bsd_mutex.cc b/winsup/cygserver/bsd_mutex.cc
index 52531bc..13c5f90 100644
--- a/winsup/cygserver/bsd_mutex.cc
+++ b/winsup/cygserver/bsd_mutex.cc
@@ -275,13 +275,12 @@ public:
 };
 
 static msleep_sync_array *msleep_sync;
+extern struct msginfo msginfo;
+extern struct seminfo seminfo;
 
 void
 msleep_init (void)
 {
-  extern struct msginfo msginfo;
-  extern struct seminfo seminfo;
-
   msleep_glob_evt = CreateEvent (NULL, TRUE, FALSE, NULL);
   if (!msleep_glob_evt)
     panic ("CreateEvent in msleep_init failed: %u", GetLastError ());