Make platform guards in two regression tests match meson builds

collate.linux.utf8 skips itself unless version() matches "linux-gnu",
and infinite_recurse skips itself when version() matches
"powerpc64[^,]*-linux-gnu".  configure substitutes the GNU host triplet
into that string, but the meson build composes it from
host_machine.cpu_family() and host_system, which never carries the ABI
suffix.  So ever since meson support arrived in 16, collate.linux.utf8
has not run at all on a meson build, and infinite_recurse has been
running on ppc64 Linux the very case it means to stay away from.
Meson documentation says it reports 'ppc64' instead of 'powerpc64'.

Fix by matching "-linux[-,]" and "p(ower)?pc64[^,]*-linux", which match
all spellings.  Keeping the punctuation on either side confines the
match to the platform field.  Neither pattern excludes musl, but
collate.linux.utf8's other conditions already require a set of glibc
locales to be present.

Backpatch to 16, where the meson build was introduced.

Discussion: 
https://postgr.es/m/[email protected]

Reviewed-By: Jonathan Gonzalez V. <[email protected]>
Reviewed-By: Nazir Bilal Yavuz <[email protected]>

Branch
------
REL_16_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/05852c3cf102192e47e26c2a37d03abd021d5a91

Modified Files
--------------
src/test/regress/expected/collate.linux.utf8.out   | 2 +-
src/test/regress/expected/collate.linux.utf8_1.out | 2 +-
src/test/regress/expected/infinite_recurse.out     | 2 +-
src/test/regress/expected/infinite_recurse_1.out   | 2 +-
src/test/regress/sql/collate.linux.utf8.sql        | 2 +-
src/test/regress/sql/infinite_recurse.sql          | 2 +-
6 files changed, 6 insertions(+), 6 deletions(-)

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