package/mediastreamer: bump to version 4.3.1

package/mediastreamer: bump to version 4.3.1

- Drop first patch (already in version)
- Update second patch
- License is GPL-3.0+ since version 4.3.0 and
  https://gitlab.linphone.org/BC/public/mediastreamer2/commit/85094197cfaaaa8768a86562a0bce9d3d738d2da
- Switch to cmake-package and so drop third patch as autotools is not
  updated anymore (and fails to build due to missing po/Makefile.in.in)
- Add a mandatory dependency to mbedtls (to enable crypto support in
  bctoolbox)
- Add bcg729, jpegturbo, libgsm, libpcap, libsrtp and zxing-cpp optional
  dependencies
- Add a dependency on dynamic library as no pkg-config calls are done in
  cmake (static build with ffmepg and opus will fail for example)
- Drop libupnp optional dependency (not available anymore)

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>