ENH: Restore rejection of -frename-registers and -ffloat-store
ENH: Restore rejection of -frename-registers and -ffloat-store

These flags were rejected as of commit 0df420fa (Check that error
inducing compiler flag is not present, 2005-09-14) and commit 65a5c2f6
(The gcc compiler -ffloat-store option causes runtime errors for gcc
3.2.3, 2005-10-05) but the check was removed during modularization.

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