Albrecht Schlosser 49a78bc482 Fix cairo build (autoconf + CMake) + README's
- rewrite to use pkg-config with both autoconf + CMake
- remove hardcoded library names
- fix build dependencies and search directories
- remove or replace old and unused variables
- update README files

To be done:
- implement fallback for autoconf/configure if pkg-config is missing
- fix pango build (uses cairo internally)
2021-03-01 10:45:59 +01:00
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