LU-18054 build: Debian 12 with module-assistant 0.11.11

LU-18054 build: Debian 12 with module-assistant 0.11.11

Building with module-assistant 0.11.11 fails in module-assistant
prep-deb-files generic.make rule:

   The required compiler '<...gcc-12 make...>' is not installed, \
   won't continue!
   Set RELAX_CC_CHECK variable to skip plausibility checks.

Suppress the auto detection by explicitly setting
CC and RELAX_CC_CHECK when running m-a

HPE-bug-id: LUS-12443
Test-Parameters: trivial
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: Icb2330884b542ba2a1a36b0318a3551c14c8ea09
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55817
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Caleb Carlson <caleb.carlson@hpe.com>
Reviewed-by: Shuichi Ihara <sihara@ddn.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>