- remove libjpeg-devel and zlib-devel from libtiff-devel
requires as they are _not_ required to use the library.
Now, this _will_ break packages with wrong buildrequires
for good.
- Hide private symbols using gcc visibility, this has been
applied only to functions that the source code clearly states
that are internal to the library.
- Run spec cleaner
OBS-URL: https://build.opensuse.org/request/show/99532
OBS-URL: https://build.opensuse.org/package/show/graphics/tiff?expand=0&rev=35
