gsm: fix cross with Clang

"clang" is not the correct value for CC when cross compiling — it
should be the prefixed, wrapped clang for the host platform.  Let's
force the use of our original CC in all cases.  The default flags of
-ansi -pedantic don't matter to us — it builds fine without -ansi, and
-pedantic doesn't really belong in a package build.  This is probably
why the author put them in CC to begin with.

There's also no need tot modify the Makefile to change = to ?=, as =
variables can be overridden on the command line.

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