Miscellaneous sys/ucontext.h namespace fixes (bug 21457).

This patch fixes various miscellaneous namespace issues in
sys/ucontext.h headers.

Some struct tags are removed where the structs also have *_t typedef
names, while other struct tags without such names are renamed to start
__; the changes are noted in NEWS as they can affect C++ name mangling
(although there seems to be little if any external use of these types,
at least based on checking codesearch.debian.net).  For powerpc,
pointers to struct pt_regs (not defined in this header) are changed to
point to struct __ctx(pt_regs), so in the __USE_MISC case those struct
fields continue to point to the existing struct pt_regs type for
maximum compatibility, while when that's a namespace issue they point
to a struct __pt_regs type which is always an incomplete struct.

Tested for affected architectures with build-many-glibcs.py.

	[BZ #21457]
	* sysdeps/unix/sysv/linux/m68k/sys/ucontext.h (fpregset_t): Remove
	struct tag.
	* sysdeps/unix/sysv/linux/mips/sys/ucontext.h (fpregset_t):
	Likewise.
	* sysdeps/unix/sysv/linux/nios2/sys/ucontext.h (mcontext_t):
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h (pt_regs):
	Declare struct type with __ctx.
	[__WORDSIZE != 32] (mcontext_t): Use __ctx with pt_regs struct
	tag.
	(ucontext_t) [__WORDSIZE == 32]: Use __ctx with pt_regs struct tag
	and regs field name.

1 files changed, 5 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index b8deb9c2..22c43f5 100644
--- a/NEWS
+++ b/NEWS
@@ -97,6 +97,11 @@ Version 2.26
 * The ucontext_t type no longer has the name struct ucontext.  This changes
   the C++ name mangling for interfaces involving this type.
 
+* On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
+  the name struct fpregset.  On Nios II GNU/Linux, the mcontext_t type no
+  longer has the name struct mcontext.  This changes the C++ name mangling
+  for interfaces involving those types.
+
 * The synchronization that pthread_spin_unlock performs has been changed
   to now be equivalent to a C11 atomic store with release memory order to
   the spin lock's memory location.  This ensures correct synchronization