c124baaf29

This patch updates the C library headers to provide ucontext_t definitions for three architectures. + Fix <signal.h> to always define 'struct sigcontext'. The new declarations are announced with new macros defined in <sys/cdefs.h> in order to make it easier to adapt client code that already defines its own, incompatible, versions of the structures seen here. http://code.google.com/p/android/issues/detail?id=34784 Change-Id: Ie78c48690a4ce61c50593f6c39639be7fead3596
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