CMake: try to fix the Haiku build.

If we set CMAKE_C_FLAGS_INIT to "-fPIC" before setting the project, that
initializes CMAKE_C_FLAGS to "-fPIC" *before* prepending the contents of
the CFLAGS environment variable, and *before* doing any tests that
depend on linking, in the project() command, so it 1) adds -fPIC before
doing those tests, so they don't fail due to the object files being
unfit to link into an executable, and 2) adds the contents of CFLAGS to
CMAKE_C_FLAGS, so the user can set CFLAGS and have it affect the build.

This requires CMake 3.7 or later, so we set 3.7 as the minimum required
on Haiku.

This should fix some of #996, although more needs to be done.

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