[newlib-cygwin] sys/_bitset.h: Fix fall-out from commit 5e04571cf3c

[Sebastian Huber <sh@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=2f6651097e7c2bf6323745ff332cc8e9df0564b2

commit 2f6651097e7c2bf6323745ff332cc8e9df0564b2
Author: Konstantin Belousov <kib@FreeBSD.org>
Date:   Tue Dec 7 20:15:30 2021 +0100

    sys/_bitset.h: Fix fall-out from commit 5e04571cf3c
    
    The changes to the bitset macros allowed sched.h to be included into
    userland programs without name space pollution due to BIT_* and
    BITSET_* macros.
    
    The definition of a global variable "bitset" had been overlooked.
    This name space pollution caused a compile failure in print/miktex.
    
    This commit renames the bitset variable to __bitset with the same
    mapping back to the bitset if _KERNEL or _WANT_FREEBSD_BITSET is
    defined.
    
    This fix has been suggested by kib. It has been tested to let the
    build of the print/miktex port succeed and to not break buildworld.
    
    This commit shall be MFCed together with commit 5e04571cf3c.
    
    Reported by:    arrowd
    MFC after:      1 month

Diff:
---
 newlib/libc/sys/rtems/include/sys/_bitset.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/newlib/libc/sys/rtems/include/sys/_bitset.h b/newlib/libc/sys/rtems/include/sys/_bitset.h
index 1c167daf3..8ce632333 100644
--- a/newlib/libc/sys/rtems/include/sys/_bitset.h
+++ b/newlib/libc/sys/rtems/include/sys/_bitset.h
@@ -61,11 +61,13 @@ struct _t {								\
  * Define a default type that can be used while manually specifying size
  * to every call.
  */
-__BITSET_DEFINE(bitset, 1);
+__BITSET_DEFINE(__bitset, 1);
 
 #if defined(_KERNEL) || defined(_WANT_FREEBSD_BITSET)
 #define	BITSET_DEFINE(_t, _s)	__BITSET_DEFINE(_t, _s)
 #define	BITSET_DEFINE_VAR(_t)	__BITSET_DEFINE_VAR(_t)
+
+#define	bitset			__bitset
 #endif
 
 #endif /* !_SYS__BITSET_H_ */