add libosmotrau.pc to Makefile.am
add libosmotrau.pc to Makefile.am

telenoobie/libosmo-abis,osmobuntu/libosmo-abis,osmobuntu/libosmo-abis,osmocom/libosmo-abis,osmobuntu/libosmo-abis,osmocom/libosmo-abis,osmocom/libosmo-abis,telenoobie/libosmo-abis,osmobuntu/libosmo-abis