headers: avoid bareword attributes

Always use the __-decorated form of an attribute name in public
headers, as the bareword form is in the user's namespace, and we
don't want compilation to break just because the user defines the
bareword to mean something else.

Signed-off-by: Eric Blake <eblake@redhat.com>

winsup/cygwin/include/cygwin/config.h

@@ -41,7 +41,7 @@ extern "C" {
 #else
 #include "../tlsoffsets.h"
 #endif
-__attribute__((gnu_inline))
+__attribute__((__gnu_inline__))
 extern inline struct _reent *__getreent (void)
 {
   register char *ret;

winsup/cygwin/include/cygwin/signal.h

@@ -46,7 +46,7 @@ struct _fpstate
   __uint32_t padding[24];
 };
 
-struct __attribute__ ((aligned (16))) __mcontext
+struct __attribute__ ((__aligned__ (16))) __mcontext
 {
   __uint64_t p1home;
   __uint64_t p2home;

winsup/cygwin/include/pthread.h

@@ -223,8 +223,8 @@ void pthread_testcancel (void);
 
 #if __GNU_VISIBLE
 int pthread_getattr_np (pthread_t, pthread_attr_t *);
-int pthread_getname_np (pthread_t, char *, size_t) __attribute__((nonnull(2)));
-int pthread_setname_np (pthread_t, const char *) __attribute__((nonnull(2)));
+int pthread_getname_np (pthread_t, char *, size_t) __attribute__((__nonnull__(2)));
+int pthread_setname_np (pthread_t, const char *) __attribute__((__nonnull__(2)));
 int pthread_sigqueue (pthread_t *, int, const union sigval);
 int pthread_yield (void);
 #endif

winsup/cygwin/include/sys/ucontext.h

@@ -13,7 +13,7 @@ details. */
 
 typedef struct __mcontext mcontext_t;
 
-typedef __attribute__ ((aligned (16))) struct __ucontext {
+typedef __attribute__ ((__aligned__ (16))) struct __ucontext {
 	mcontext_t	uc_mcontext;
 	struct __ucontext *uc_link;
 	sigset_t	uc_sigmask;