newlib: Fix build on arc

newlib wasn't building properly on arc.  This patch fixes the issue.

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

patches/newlib/3.1.0/0001-work-arc-issue-with-nsim-and-fcntrl.patch

@@ -0,0 +1,37 @@
+From 8020f4b3c1b347054174177aa5cc1cec0f0ed25e Mon Sep 17 00:00:00 2001
+From: Kumar Gala <[email protected]>
+Date: Thu, 14 Feb 2019 23:34:19 -0600
+Subject: [PATCH] sys/_default_fcntl.h: workaround arc nsim build issue
+
+If we are building newlib and have MISSING_SYSCALL_NAMES defined we run
+into an issue when libgloss/arc/nsim-syscalls.c tries to build.  As
+MISSING_SYSCALL_NAMES will cause _open to become open, than we can a
+build conflict between how open is declared in sys/_default_fcntl.h and
+how its defined in nsim-syscalls.c.
+
+To workaround this we wrap the open declaration with
+	#if !defined(MISSING_SYSCALL_NAMES)
+	#endif
+
+Signed-off-by: Kumar Gala <[email protected]>
+---
+ newlib/libc/include/sys/_default_fcntl.h | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/newlib/libc/include/sys/_default_fcntl.h b/newlib/libc/include/sys/_default_fcntl.h
+index 22fa10688..9466cb1b8 100644
+--- a/newlib/libc/include/sys/_default_fcntl.h
++++ b/newlib/libc/include/sys/_default_fcntl.h
+@@ -205,7 +205,9 @@ struct eflock {
+ #include <sys/types.h>
+ #include <sys/stat.h>		/* sigh. for the mode bits for open/creat */
+ 
++#if !defined(MISSING_SYSCALL_NAMES)
+ extern int open (const char *, int, ...);
++#endif
+ #if __ATFILE_VISIBLE
+ extern int openat (int, const char *, int, ...);
+ #endif
+-- 
+2.20.1
+