.gitignore fix for flat-hierarchy binaries (re: cda1976e)

To ignore binaries generated by 'bin/package flat make', the
entries all need an initial '/' or they will be ignored on deeper
hierarchy levels as well.

.gitignore

@@ -4,39 +4,39 @@ tgz
 lcl
 
 # Flat make libs, binaries, etc
-bin/.paths
-bin/ar
-bin/cc
-bin/crossexec
-bin/ditto
-bin/filter
-bin/hurl
-bin/iffe
-bin/ksh
-bin/mamake
-bin/mktest
-bin/ok/
-bin/proto
-bin/pty
-bin/ratz
-bin/regress
-bin/release
-bin/rt
-bin/shcomp
-bin/suid_exec
-fun/
-include/
-lib/file/
-lib/lib/
-lib/libast.a
-lib/libcmd.a
-lib/libdll.a
-lib/libshell.a
-lib/libsum.a
-lib/make/
-lib/package/gen/
-lib/probe/
-man/
+/bin/.paths
+/bin/ar
+/bin/cc
+/bin/crossexec
+/bin/ditto
+/bin/filter
+/bin/hurl
+/bin/iffe
+/bin/ksh
+/bin/mamake
+/bin/mktest
+/bin/ok/
+/bin/proto
+/bin/pty
+/bin/ratz
+/bin/regress
+/bin/release
+/bin/rt
+/bin/shcomp
+/bin/suid_exec
+/fun/
+/include/
+/lib/file/
+/lib/lib/
+/lib/libast.a
+/lib/libcmd.a
+/lib/libdll.a
+/lib/libshell.a
+/lib/libsum.a
+/lib/make/
+/lib/package/gen/
+/lib/probe/
+/man/
 
 # This one keeps changing its license header, causing git to show an
 # uncommitted file. It's always re-copied anyway, and not for direct