Crt files are special cased by name when dealing with ctor and dtor

sections, but the current code misses certain variants. In particular, those
named when clang takes the code path in
clang/lib/Driver/ToolChain.cpp:416, where crtfiles are named:

clang_rt.<component>-<arch>-<env>.<suffix>

Previously, the code only handled:
clang_rt.<component>.<suffix>
<component>.<suffix>

This revision fixes that.