Compiler warnings generated on building MariaDB server for BSD has the same
reason as in case building is performed on MacOS. Both platforms do use
clang as a C/C++ compiler. So, fix the compiler warnings in case the compiler
is clang doesn't matter what kind of building platform do we use for building.
This is a follow-up patch for the following bug reports:
MDEV-23564: CMAKE failing due to deprecated Apple GSS method
MDEV-23935: Fix warnings generated during compilation of
plugin/auth_pam/testing/pam_mariadb_mtr.c on MacOS
During build server 10.4 on MacOS warnings like the following one
are generated on compiling the file plugin/auth_pam/testing/pam_mariadb_mtr.c
server-10.4/plugin/auth_pam/testing/pam_mariadb_mtr.c:25:22: error:
initializing 'char *' with an expression of type 'const char [23]'
discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
{ PAM_TEXT_INFO, "Challenge input first." }
The reason of the warnings is that the data member pam_message::msg is declared
as 'char *' on MacOS but initializer of the data member is 'const char *'.
To eliminate warnings the compiler option
-Wno-incompatible-pointer-types-discards-qualifiers
has been added to the compiler flags used for compiling the file
pam_mariadb_mtr.c.
