include curs_fix from ciolib.h to fix openSUSE

Apparently, the ncurses in openSUSE Leap-15.2 has the following:
Since we have a struct member named ESCDELAY, we can't actually set
it at all when this macro is defined.

The three possibilities to deal with this are:
1) Rename the ESCDELAY member.
   Likely the best option long-term, but I don't want to find everything
   and update it at this time.
2) Avoid using the ESCDELAY member #ifdef ESCDELAY
   Which makes it not work in the exact set of circumstances it makes
   sense in.
3) #include curs_fix.h from ciolib.h
   This actually renames the ESCDELAY member to _nc_ESCDELAY, but you
   won't be able to actually notice this.

src/conio/ciolib.h

@@ -41,6 +41,16 @@
 #include "gen_defs.h"
 #include "utf8_codepages.h"
 
+#ifndef _WIN32
+  /* This is included because it seems openSUSE Leap-15.2 apparently contains this:
+   * #define ESCDELAY _nc_ESCDELAY.
+   * which means we need to not set the ESCDELAY member (because we can't), or we
+   * need to rename the member to _nc_ESCDELAY.  Do the second because it's very
+   * *very* slightly less stupid.
+   */
+  #include "curs_fix.h"
+#endif
+
 #ifdef CIOLIBEXPORT
         #undef CIOLIBEXPORT
 #endif