Integrate the makewhatis binary into the mandoc binary

just like we do it on OpenBSD.  Smaller and neater.
While here, let ./configure set INSTALL_TARGETS.

1 files changed, 1 insertions, 1 deletions

diff --git a/mandocdb.c b/mandocdb.c
index c5289167..0cb487b1 100644
--- a/mandocdb.c
+++ b/mandocdb.c
@@ -336,7 +336,7 @@ static	const struct mdoc_handler mdocs[MDOC_MAX] = {
 
 
 int
-main(int argc, char *argv[])
+mandocdb(int argc, char *argv[])
 {
 	int		  ch, i;
 	size_t		  j, sz;