Added the contents of the "readline" module back. This is

generally unused, as it is incompatible with the Tcl/Tk build of
magic.  However, I had not intended to remove it, only move the
name from "readline-4.3" to "readline".  But "readline/readline"
was in .gitignore, which caused the contents to be removed from
the repository.  This commit restores those files, and also
prevents the readline directory Makefile from making a symbolic
link called "readline" to itself, which was causing compile-time
issues.  The readline code is only kept for backwards compatibility
with ancient versions of magic not using the Tcl/Tk interpreter.

.gitignore

@@ -14,7 +14,6 @@ database/database.h
 install.log
 magic/proto.magicrc
 make.log
-readline/readline
 scmos/gdsquery.tech
 scmos/minimum.tech
 scmos/scmos-sub.tech
@@ -32,4 +31,4 @@ magic/tclmagic.dylib
 tcltk/magicdnull.dSYM/
 tcltk/magicexec.dSYM/
 reconfigure.sh
-pfx/
+pfx/

readline/Makefile

@@ -6,10 +6,12 @@ module: readline readline/libreadline.a readline/libhistory.a
 
 depend:
 
+# NOTE:  Previously, source code was in a directory readline-4.3 and
+# recipe "readline" created a symbolic link to it.  This symbolic
+# link has been removed, and code is now just in real directory
+# "readline".
+
 readline:
-	@if ( ! test -f readline/readline ) ; then \
-	ln -s `ls | grep readline` readline ; \
-	fi
 
 readline/libhistory.a: readline/libreadline.a