Ensure consistent results if autogen.sh is run more than once #145
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Without this patch, make dist after a second autogen.sh will generate a Makefile.in that differs from after the first autogen.sh:
diff t5/remake-4.3-1+dbg-1.6/Makefile.in t6/remake-4.3-1+dbg-1.6/Makefile.in 334c334,335
< build-aux/install-sh build-aux/missing
But that is the only difference(!).
Make install results from either tarball are identical.
However the small change above does result in make dist-xz adding 440 bytes to the tarball.