Update opusfile.pc description line.
-rw-r--r-- 396 .gitignore
-rw-r--r-- 262 AUTHORS
-rw-r--r-- 1487 COPYING
-rw-r--r-- 2085 Makefile.am
-rw-r--r-- 77 README.txt
-rwxr-xr-x 250 autogen.sh
drwxr-xr-x - ci
-rw-r--r-- 4413 configure.ac
drwxr-xr-x - doc
drwxr-xr-x - examples
drwxr-xr-x - include
drwxr-xr-x - m4
-rw-r--r-- 365 opusfile-uninstalled.pc.in
-rw-r--r-- 342 opusfile.pc.in
drwxr-xr-x - src
drwxr-xr-x - unix