haskell/ghc: Install the man page in the correct place.

Signed-off-by: Matteo Bernardini <ponce@slackbuilds.org>

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

haskell/ghc/ghc.SlackBuild

@@ -145,7 +145,7 @@ find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | gr
 # If docs were not built and installed, let's install the prebuilt manpage
 # (taken from the prebuilt tarball)
 if [ ! -d $PKG/usr/man ]; then
-  install -D -m0644 $CWD/ghc.1 $PKG/usr/man/man1
+  install -D -m0644 $CWD/ghc.1 $PKG/usr/man/man1/ghc.1
 fi
 
 # Install the bash completion file too