Bugfix: consider /usr/bin/cc and usr/bin/c++ for auto-detection

[SSE4]

#TAGS: svn, slow
#REVISIONS: 1

closes: #4322
NOTE: this is the same changes as #7586 (changes were reverted in #7638).
plus it ensures Visual Studio always has priority over /usr/bin/cc or /usr/bin/c++.

Changelog: Bugfix: consider /usr/bin/cc and usr/bin/c++ for auto-detection
Docs: omit

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[memsharded]

Closing this as outdated. Automatic profile detection is no longer a thing in 2.0, it has to be explicit, and it has been declared not-stable and not-production, users should be using their profiles.