[Rpm-maint] [rpm-software-management/rpm] Fix a couple of issues with removing the GNU suffixes from the target triplets. (PR #1845)

[Peter Pentchev]

So I just added an updated version of these two commits that also recognizes the -gnuabi64 suffix used on some mipsel architectures. It turned out that the guard that I added at the end of the last commit - abort the configure script if we could not remove the -gnu suffix - actually worked: see the failed build at https://buildd.debian.org/status/fetch.php?pkg=rpm&arch=mips64el&ver=4.17.0%2Bdfsg1-2&stamp=1638004797&raw=0 (search for "unrecognized GNU build triplet").

For a demonstration of what happens with or without these patches, compare the Debian package builds of RPM for the armhf architecture (search for "usr/lib/rpm/platform"; there was already a Debian package patch that made installing the platform macros files more verbose):
- before the change: https://buildd.debian.org/status/fetch.php?pkg=rpm&arch=armhf&ver=4.17.0%2Bdfsg1-1&stamp=1637452078&raw=0
- after the change: https://buildd.debian.org/status/fetch.php?pkg=rpm&arch=armhf&ver=4.17.0%2Bdfsg1-2&stamp=1637970471&raw=0

Thanks again for your time!

G'luck,
Peter

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