Signed-off-by: David Runge <dvzrv@archlinux.org>

Switch to correct SPDX license identifiers for project.
Declare sodepends not globally, but in the package() function so that they may not pull in wrong dependencies.

Remove unnecessary quotes and curly braces.
Prevent libtool from overlinking.
Use bash arrays with one entry per line for better handling.

Add patch to not install libgig.so namespaced, as that requires a ld.so.conf override.

Remove ld.so.conf integration, as it is (hopefully) not required anymore.

Adding back ld.so.conf entry, as it is required for libgig dependants during runtime.

Upgrading to 4.2.0. Switching to correct license (GPL2). Adding provides for libgig.so, so it can be tracked.
Adding autoreconf to prepare(). Installing docs. Removing ld.so.conf.d entry (this should not be required with pkg-config).

Switching to sha512sums. Minor fixes.

FTR, commands used to change arch=() and then verify the changes:

$ sed -Ei "/^arch=/{s/ *?['\"]?i686['\"]? *?//;s/ *$//}" */*/PKGBUILD*

$ grep -r i686 * | grep arch= | grep -v repos

$ svn diff | grep -A 1 ^-[^-] | grep -v -- -- | cut -c2- |
  while IFS=$'\n' read -r l1; IFS=$'\n' read -r l2; do
    echo "$l1 -> $l2"
  done | sort -u