Allow for file-specific compilation flags.
Allow for file-specific compilation flags.

If you have a file foo.c that needs particular compilation options, you
can now define (say, in the Makefile.share that is used for foo.c) a
"make" variable "foo_CFLAGS" containing those options.  This variable is
expanded on the compilation command line after RUNTIME_CFLAGS is, so it
can override the default runtime compilation options.


git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@16473 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,chizarlicious/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,sungeunchoi/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel