Update obsolete comment in index_drop(). When the comment was written,
tree76f6a12bcfc17948c4f24a0bb57de8c271f4f5aa
-rw-r--r-- 1192 COPYRIGHT
-rw-r--r-- 4269 GNUmakefile.in
-rw-r--r-- 1423 Makefile
-rw-r--r-- 1287 README
-rw-r--r-- 767 README.CVS
-rw-r--r-- 387 aclocal.m4
drwxr-xr-x - config
-rwxr-xr-x 800276 configure
-rw-r--r-- 60961 configure.in
drwxr-xr-x - contrib
drwxr-xr-x - doc
drwxr-xr-x - src