Resolve SPI-1450 - graphviz lacking support for png in LCG 96
Changed the way to deal with PKG_CONFIG_PATH.
- We need to add the system /usr/lib[64]/pkgconfig at the end of PKG_CONFIG_PATH to locate the packages taken from the system.
- Changed the way to build pkg-config with the option
--with-system-library-path /usr/lib[64]
to avoid the-L/usr/lib[64]
. Similarly with the include path. - Cleanup recipes adding PKG_CONFIG_PATH
- Fix the setup.[c]sh for the views wrt. PKG_CONFIG_PATH