* sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S: Use

* sysdeps/unix/sysv/linux/powerpc/powerpc64/setcontext.S: Use

	.machine push; .machine "power6" and .machine pop around mtfsf
	insns outside of _ARCH_PWR6 define.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/swapcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext-common.S:
	Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S:
	Likewise.
	* sysdeps/powerpc/fpu/tst-setcontext-fpscr.c (_SET_DI_FPSCR): Likewise.
	* sysdeps/powerpc/fpu/fenv_libc.h (fesetenv_register,
	relax_fenv_state): Likewise.