* sparc-linux-tdep.c: Reorder includes. Tweak a few comments.

* sparc-linux-tdep.c: Reorder includes.  Tweak a few comments.
(LINUX32_SIGTRAMP_INSN0, LINUX32_SIGTRAMP_INSN1)
(LINUX32_RT_SIGTRAMP_INSN0, LINUX32_RT_SIGTRAMP_INSN1): Remove
macros.
(sparc32_linux_sigframe, sparc32_linux_rt_sigframe): Hardcode
instructions.
* sparc64-linux-tdep.c: Reorder includes.  Tweak a few comments.
(LINUX64_RT_SIGTRAMP_INSN0, LINUX64_RT_SIGTRAMP_INSN1): Remove
macros.
(sparc64_linux_rt_sigframe): Hardcode instructions.
* Makefile.in (sparc-linux-tdep.o, sparc64-linux-tdep.o): Update
dependencies.