Created default c2man compatible perl script for generating
documentation, in case c2man isn't installed.

configure.in

diff --git a/configure.in b/configure.in
index 37b1d93..3c4be24 100644
--- a/configure.in
+++ b/configure.in
@@ -70,7 +70,7 @@
 AC_PROG_RANLIB
 AC_PROG_INSTALL
 AC_PROG_LN_S
-AC_CHECK_PROG(C2MAN,c2man,c2man,true)
+AC_CHECK_PROG(C2MAN,c2man,c2man,\$(TOPSRCDIR)/tools/c2man.pl)
 AC_PATH_PROG(LDCONFIG, ldconfig, true, /sbin:/usr/sbin:$PATH)
 
 dnl Check for lint