configure.ac : Only use AM_SILENT_RULES if its available. Thanks Earl Chew.
configure.ac : Only use AM_SILENT_RULES if its available. Thanks Earl Chew.

waitman/flac,kode54/flac,Distrotech/flac,LordJZ/libflac,waitman/flac,kode54/flac,Distrotech/flac,fredericgermain/flac,fredericgermain/flac,LordJZ/libflac,waitman/flac,waitman/flac,fredericgermain/flac,LordJZ/libflac,fredericgermain/flac,LordJZ/libflac,Distrotech/flac,waitman/flac,Distrotech/flac,kode54/flac,kode54/flac