[Openmp-dev] Large Refactor of CMake build system [FIXED]

[C Bergström]

<big fat snip>
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Attached are 2 potential patches which resolve the issue we're hitting
(I let someone else decide which one or modify as needed)

Summary:
libomp_check_linker_flag rewrites src_to_link.c and CMakeLists.txt in
build directory for test project, but cmake does not rebuild the
project. The root cause is that on some filesystems (ext3, reiserfs)
timestamp resoultion is 1 second. So cmake does not rebuild test
project if check takes less than 1 second.

Comments: These checks are somewhat stupid and it would be nice to be
able to disable them. I don't know of any other llvm project
essentially doing this
write small CMake file just for testing; run cmake; test; etc

Solution:
The work-around is to build test projects in different subdirs.

One patch uses variable name instead of flag name for subdirectory
names, to avoid use of special symbols in directory name (-- , /).

Please decide and push ASAP.
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