Cygwin: proc: fix /proc/version output after uname change

3.0.0 changed uname but missed to align /proc/version
which then used the old uname function on the new uname
struct.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygwin/fhandler_proc.cc

@@ -405,6 +405,8 @@ fhandler_proc::fill_filebuf ()
   return false;
 }
 
+extern "C" int uname_x (struct utsname *);
+
 static off_t
 format_proc_version (void *, char *&destbuf)
 {
@@ -413,7 +415,7 @@ format_proc_version (void *, char *&destbuf)
   char *bufptr = buf;
   struct utsname uts_name;
 
-  uname (&uts_name);
+  uname_x (&uts_name);
   bufptr += __small_sprintf (bufptr, "%s version %s (%s@%s) (%s) %s\n",
 			  uts_name.sysname, uts_name.release, USERNAME, HOSTNAME,
 			  GCC_VERSION, uts_name.version);

winsup/cygwin/release/3.0.5

@@ -0,0 +1,13 @@
+What's new:
+-----------
+
+
+What changed:
+-------------
+
+
+Bug Fixes
+---------
+
+- Fix /proc/version after uname change
+  Addresses: https://cygwin.com/ml/cygwin/2019-03/msg00467.html