Debian point release 11.1 was done over the weekend which caused
fm-common's Makefile to only detect python2.7 rather than python3.9.
Make sure we are only detecting the os release and not the version
number.
Task: 2009101
Story: 43601
Signed-off-by: Charles Short <charles.short@windriver.com>
Change-Id: I387b0a5436048dc13576d658aa34b5b0db5271ac
c548d99b51