bootstrap: Always use environment variables for build #2546
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This fixes a case where libtbx failed to configure with conda compilers on MacOS 14 (Sonoma). Since the build system doesn't attempt to work out what fundamental flags are needed to do basic compiler checks itself, defer this decision to the configured environment directly.
In most cases using DIALS bootstrap, this will end up being just the flags from the configured conda environment.
This also has the side-effect of better aligning the built DIALS objects between CMake and the libtbx SCons variant builds.
Fixes #2532.