Add files from newer autotools to .gitignore
tests/rtp/sendcodecs: pass a GError to parse_launch.

Otherwise for some reason launch_full returns a pipeline
even when an element is missing, despite the FATAL_ERRORS flag.
rtp-codec-nego: Actually test that the codec id is valid

Bug found by David Binderman <dcb314@hotmail.com>
examples: Remove unused variable
rtpsession: Need to read the method on stop too

Otherwise it used an initialized variable. Thank you clang-analyzer
transmitters: include <netinet/in.h> for IPPROTO_*

POSIX says that we need <netinet/in.h> for IPPROTO_* to be defined, so
make sure we include it.

It also ensures that we get a definition of 'struct sockaddr' which
appears in the rawudp header as an argument type.
raw: Fix crash where the stream would try to contact its session before its been set
Include <sys/uio.h> for struct iovec.
Include <netinet/in.h> for struct sin_addr.
Add m4/.gitignore