pcr/pjproject: update to 2.8 and fix illegal instructions

This is based on the PKGBUILD available on aur here:
https://aur.archlinux.org/pjproject.git

Before this package was built with -march=native, so if you build
it on a machine with a processor that supports avx (Advanced Vector
Extensions), libpjsip.so.2 ended up with vpxor instructions that
were also executed on machines with a processor that did not have
such extension, which resulted in an illegal instruction at asterisk
startup.

libwebrtc is disabled in order not to require sse2 on i686:
- Parabola's minimum system requirements states that:
  "Parabola GNU/Linux-libre should run on any i686 compatible machine
   [...]"
- Wikipedia states that i686 has MMX and SSE[2]
- The Asterisk Changelog has the following:
  "pjproject_bundled:  Add --disable-libwebrtc to configure

   Without the disable, pjproject tries to build it's internal
   webrtc implementation which requires sse2.  This fails on
   platforms without sse2."
- In package(), a trailing '*' was added to
  pjsip-apps/bin/pjsua-*gnu in order to catch binaries like
  pjsip-apps/bin/pjsua-armv7l-unknown-linux-gnueabihf on ARM.

The package build was tested on x86_64, i686 and armv7h.
On x86_64 I verified that libpjsip.so.2 did not have vpxor
instructions anymore with objdump -D libpjsip.so.2 | grep vpxor

References:
-----------
[1]https://wiki.parabola.nu/Beginners%27_Guide
[2]https://en.wikipedia.org/wiki/P6_(microarchitecture)

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

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