Update license and add dependencies specifed by namcap, closes #1

Erwin Iosefrequested to merge
erwin-iosef/links:uppkg into main

Fixed the license of links to GPL-2.0-and-later as specified in the webiste, added dependencies reported by namcap.

links E: The SPDX license statement 'GPL' should be formatted as 'GPL-1.0-or-later' instead
links W: Dependency libpng detected but optional (libraries ['usr/lib/libpng16.so.16'] needed in files ['usr/bin/xlinks'])
links W: Dependency libx11 detected but optional (libraries ['usr/lib/libX11.so.6'] needed in files ['usr/bin/xlinks'])
links W: Dependency glibc detected and implicitly satisfied (libraries ['usr/lib/libc.so.6', 'usr/lib/libm.so.6'] needed in files ['usr/bin/xlinks', 'usr/bin/links'])
links W: Dependency libjpeg-turbo detected and implicitly satisfied but optional (libraries ['usr/lib/libjpeg.so.8'] needed in files ['usr/bin/xlinks'])
links W: Dependency zlib-ng-compat detected and implicitly satisfied (libraries ['usr/lib/libz.so.1'] needed in files ['usr/bin/xlinks', 'usr/bin/links'])
links W: Dependency libtiff detected but optional (libraries ['usr/lib/libtiff.so.6'] needed in files ['usr/bin/xlinks'])
links W: Dependency gcc-libs detected and implicitly satisfied (libraries ['usr/lib/libgomp.so.1'] needed in files ['usr/bin/xlinks'])

And added libwebp and libjpeg-turbo as optional and make dependencies for xlinks, webp images still weren't visible in the official pkg provided by Arch.

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