git-version-gen not EBCDIC compatible

[Steve Goetze]

The following line in m4-1.4.14/build-aux/git-version-gen causes a build
failure on z/OS (EBCDIC codeset):

# Omit the trailing newline, so that m4_esyscmd can use the result directly.
echo "$v" | tr -d '\012'

Octal 12 does not represent new line in EBCDIC.  Is there a reason that this
can't be:

# Omit the trailing newline, so that m4_esyscmd can use the result directly.
echo "$v" | tr -d '\n'

Regards,
--Steve Goetze