[PATCH] Raise the minimum GCC version to GCC 7.1 [BZ #32420]

[Joseph Myers]

If you wish to propose such a change, please engage with the discussion 
that started at 
<https://sourceware.org/pipermail/libc-alpha/2024-October/160713.html> of 
the advantages and disadvantages of making a change here.  More detailed 
information about how much cleanup in glibc sources would be enabled would 
also be useful (recall that installed headers are meant to work with old 
compilers - this is only about non-installed files that aren't shared with 
other projects such as gnulib).

-- 
Joseph S. Myers
josmyers@redhat.com