const up my_uca1400_collation_definitions

[caolanm]

move this symbol out of the .data section

[9EOR9]

This PR doesn't build:

/home/runner/work/mariadb-connector-c/mariadb-connector-c/libmariadb/ma_charset.c: In function ‘my_uca1400_collation_id_uca400_compat’:
/home/runner/work/mariadb-connector-c/mariadb-connector-c/libmariadb/ma_charset.c:1046:12: error: assignment discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
 1046 |   if (!(def= &my_uca1400_collation_definitions[tlid])->name)
      |            ^
cc1: all warnings being treated as errors

[caolanm]

apologies, this version now builds for me