Add workaround for buggy cairomm pkg-config installs

Fixes: #410
6 jobs for master in 198 minutes and 1 second (queued for 162 minutes and 38 seconds)
Status Job ID Name Coverage
  Test
passed #2894
amd64
job_clang_amd64

02:44:21

passed #2898
amd64
job_clang_amd64_nosh

02:20:27

passed #2896
amd64
job_clang_py2_amd64

02:41:49

passed #2893
amd64
job_gcc_amd64

02:06:48

passed #2897
amd64
job_gcc_amd64_nosh

01:46:16

passed #2895
amd64
job_gcc_py2_amd64

02:10:37