gstreamer1.0-rtsp-server: Transition to meson based builds
Following modifications were performed:
- Remove reference to autotools/M4 related patch:
[0001-introspection.m4-prefix-pkgconfig-paths-with-PKG_CON.patch]
- Drop reference to gettext handling
- Remove all autotooling class references and functions and replace them
with meson class
- Add patch to fix GIR support in the meson.build file
