Do not overwrite config.status while executing it.
* Makefile.in (MAKEFILE_NAME): New macro. ($(MAKEFILE_NAME)): Rename rule from Makefile. * configure.ac (epaths): Set MAKEFILE_NAME to a bogus value, so that GNU 'make' isn't tempted to make the Makefile and then regenerate config.status while config.status is running. Fixes: debbugs:11214
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