make collate.linux.utf8 test run on more places

hi.
on my local machine.

select version();
version
--------------------------------------------------------------------------------------------
PostgreSQL 19devel_debug_build_630a93799d5 on x86_64-linux, compiled
by gcc-14.1.0, 64-bit
(1 row)

https://www.postgresql.org/message-id/16501.1564338688%40sss.pgh.pa.us
QUOTE""
Actually, scraping the buildfarm database suggests that checking
version() for "linux" or even "linux-gnu" would work very well.
"""

I would like change
version() !~ 'linux-gnu'
to
version() !~ 'linux'

so that src/test/regress/sql/collate.linux.utf8.sql can run on my system.

--
jian
https://www.enterprisedb.com/