constify sparc-sol2-tdep.c and spu-tdep.c

constify sparc-sol2-tdep.c and spu-tdep.c

/home/pedro/gdb/mygit/src/gdb/sparc-sol2-tdep.c: In function ‘const char* sparc_sol2_static_transform_name(const char*)’:
/home/pedro/gdb/mygit/src/gdb/sparc-sol2-tdep.c:247:35: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]
       char *p = strrchr (name, '.');
                                   ^
gdb:

2015-03-20  Pedro Alves  <palves@redhat.com>

	* sparc-sol2-tdep.c (sparc_sol2_static_transform_name): Make "p" const.
	* spu-tdep.c (spu_gdbarch_init): Make "name" const.