Remove code duplication by unifying the certificatelist. You should now check for isInstallCert to determine wether this certificate should be installed or removed. Leaving the getInstallCertificates and getRemoveCertificates in place for compatibilty would have been easier to keep the tests stable.

set (m13_common_src
   listutil.c
   strhelp.c
   portpath.c
)

add_library(m13_common STATIC ${m13_common_src})