cmake fails to check for sasl

[dmulder]

[ 4s] /home/abuild/rpmbuild/BUILD/admc-0.9.0/src/adldap/ad_interface.cpp:47:10: fatal error: sasl/sasl.h: No such file or directory
[ 4s] 47 | #include <sasl/sasl.h>
[ 4s] | ^~~~~~~~~~~~~
[ 4s] compilation terminated.

I'm working on packaging this in openSUSE, and noticed that you fail to require sasl during configuration. Installing sasl resolves the build failure.