bootstrap: try better workaround for builds on Linux/HPPA

The workaround currently present works fine without -O or with -O1, but fails
with -Os or -O2 and higher. Using -O2 is common e.g. in Gentoo, as resulting in
bugs like this:

https://bugs.gentoo.org/473276

Prevent the workaround for higher optimization levels to make bootstrapping
more likely to succeed.

This is still a workaround as ld still keeps crashing in some situations.
CMake Nightly Date Stamp
Merge topic 'hppa-bootstrap'

ca63bb1 bootstrap: try better workaround for builds on Linux/HPPA
bash-completion: Future-proof --help-*-list "cXXXX version" filtering

A future version of CMake may not print the "cmake version" line at the
beginning of the --help-*-list output.  Filter out the line with 'grep'
instead of 'tail' to tolerate output from versions of CMake with and
without the version line.  Match "cmake version", "cpack version", and
"ctest version" in each corresponding completion script.
Merge topic 'bash-completion-future-filter'

a8d7141 bash-completion: Future-proof --help-*-list "cXXXX version" filtering