common: Add a missing dependency on cc-common-resources.h
From the commit message:
cc-common-resources.h is used by both libwidgets and liblanguage, and
so must be generated before they build. However, Meson wasn't aware
of this dependency which resulted in a race condition during build.
Conveniently, "generates_sources_dep" already contains other generated
sources used by these two libraries, so adding cc-common-resources.h
to this list is enough to declare the dependency.