add --disable-doxygen-docs options (sf patch #1365935 https://sourceforge.net/tracker/index.php?func=detail&aid=1365935&group_id=13478&atid=313478)
add --disable-doxygen-docs options (sf patch #1365935 https://sourceforge.net/tracker/index.php?func=detail&aid=1365935&group_id=13478&atid=313478)

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