compel/ppc64: glibc renamed ucontext to ucontext_t

The upcoming glibc release renamed 'struct ucontext' to
'struct ucontext_t':

https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=251287734e89a52da3db682a8241eb6bccc050c9;hp=c86ed71d633c22d6f638576f7660c52a5f783d66

Instead of using 'struct ucontext' this patch changes it
to the typedef ucontext_t which already exists in older and
new versions of glibc.
Signed-off-by: Adrian Reber <areber@redhat.com>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/arch/ppc64/src/lib/include/uapi/asm/sigframe.h

@@ -28,12 +28,12 @@
 #define TRAMP_SIZE			6
 
 /*
- * ucontext defined in /usr/include/powerpc64le-linux-gnu/sys/ucontext.h
+ * ucontext_t defined in /usr/include/powerpc64le-linux-gnu/sys/ucontext.h
  */
 struct rt_sigframe {
         /* sys_rt_sigreturn requires the ucontext be the first field */
-        struct ucontext			uc;
-        struct ucontext			uc_transact; /* Transactional state	 */
+        ucontext_t			uc;
+        ucontext_t			uc_transact; /* Transactional state	 */
         unsigned long			_unused[2];
         unsigned int			tramp[TRAMP_SIZE];
         struct rt_siginfo		*pinfo;

criu/arch/ppc64/crtools.c

@@ -259,7 +259,7 @@ static int put_tm_regs(struct rt_sigframe *f, UserPpc64TmRegsEntry *tme)
  *   For the case of getting a signal and simply returning from it,
  *   we don't need to re-copy them here.
  */
-	struct ucontext *tm_uc = &f->uc_transact;
+	ucontext_t *tm_uc = &f->uc_transact;
 
 	pr_debug("Restoring TM registers FP:%d VR:%d VSX:%d\n",
 		 !!(tme->fpstate), !!(tme->vrstate), !!(tme->vsxstate));