graphviz: add $PYTHON_PREFIX/lib to linker search path

Make sure the active python framework's
lib directory is in the linker search path.

Fixes #32180.

Closes #32194.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
graphviz: general cleanup.
pyexiv2: fix build failure.
pyexiv2: use double-quotes
pyexiv2: add 0.3.2 bottle.