[newlib-cygwin] Provide FNONBLOCK for BSD compatiblity

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=78c9002201775c93e1a2fd54ccf464d37c2c767e

commit 78c9002201775c93e1a2fd54ccf464d37c2c767e
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Fri Apr 15 13:44:29 2016 +0200

    Provide FNONBLOCK for BSD compatiblity
    
    Signed-off-by: Sebastian Huber <sebastian.huber@embedded-brains.de>

Diff:
---
 newlib/libc/include/sys/_default_fcntl.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/newlib/libc/include/sys/_default_fcntl.h b/newlib/libc/include/sys/_default_fcntl.h
index 3be8f8d..ede90c4 100644
--- a/newlib/libc/include/sys/_default_fcntl.h
+++ b/newlib/libc/include/sys/_default_fcntl.h
@@ -99,6 +99,10 @@ extern "C" {
 
 #endif	/* __MISC_VISIBLE */
 
+#if __BSD_VISIBLE
+#define	FNONBLOCK	_FNONBLOCK
+#endif	/* __BSD_VISIBLE */
+
 /* XXX close on exec request; must match UF_EXCLOSE in user.h */
 #define	FD_CLOEXEC	1	/* posix */