ralloc: Annotate printf functions with PRINTFLIKE(...)

ralloc: Annotate printf functions with PRINTFLIKE(...)

Catches problems such as (in the gles3 branch)

glcpp-parse.y: In function '_glcpp_parser_handle_version_declaration':
glcpp-parse.y:1990:39: warning: format '%lli' expects argument of type
	'long long int', but argument 4 has type 'int' [-Wformat]

As a side-effect, remove ralloc.c's likely/unlikely macros and just use
the ones from main/compiler.h.

NOTE: This is a candidate for the release branches.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>