* i386-stub.c, m32r-stub.c, m68k-stub.c, sh-stub.c, sparc-stub.c,
sparcl-stub, sparclet-stub.c: Change declaration of putDebugChar
to include explicit void return type as per documentation. Fix up
occasions where stubs erroneously checked return type.
* sparc-tdep.c (sparc_extract_struct_value_address): Simplify to use
same method on both 32-bit and 64-bit machines.
* sparcl-tdep.c (sparclite_check_watch_resources): Simulator doesn't
support hardware breakpoints.
* config/sparc/tm-sparc.h (CALL_DUMMY): Improve comments.