FortranCInterface: Reuse primary detection results in VERIFY function

Since commit 14f7a043e3 (Teach FortranCInterface to load outside
results, 2009-08-24, v2.8.0~262) we support passing the detection
results into `try_compile` by forwarding `FortranCInterface_BINARY_DIR`.
Use this in `FortranCInterface_VERIFY` to avoid repeating detection.
1 file changed