Log Message:
Fix build by increasing BUILDLINK_API_DEPENDS.pangomm. Error was:

checking for GDKMM... configure: error: Package requirements (giomm-2.4 >= \ 
2.22 pangomm-1.4 >= 2.26 gtk+-2.0 >= 2.18) were not met:

Requested 'pangomm-1.4 >= 2.26' but version of Pangomm is 2.24.0

(2.24.0 doesn't provide needed pangommconfig.h.)

While here remove now-irrelevant comment from buildlink3.mk.