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build_cffi_imports: fix determining CFLAGS

The previous logic implicitly assumed that CFLAGS was either unset or
started with a space, breaking the MacPorts build. In addition, it
also extracted the version info from the _running_ interpreter rather
than the _built_ one.

--HG--
branch : py3.8-fix-cflags
2 jobs for branch/py3.8-fix-cflags in 29 minutes and 11 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed check_rpython_annotations #251350

00:07:26

passed hpy_tests #251351

00:29:11