Add CRASHREPORT, show contact form on panic/impossible

When calling panic() or impossible(), create the option
of opening a browser window with most of the fields
already populated.  Code for MacOS and linux is included;
other ports are affected by argument change to early_init
which are done but not tested.

To enable, define CRASHREPORT in config.h and set
CRASHREPORTURL in sysconf to (for the moment at least)
http[s]://www.nethack.org/common/contactcr.html

Adds --grep-defined option to makedefs for Makefiles.

Adds "bid" (binary identifier), an MD4 of the main nethack
binary.  This is ONLY for helping (in the future) contact.html
to set the "NetHack from" field automatically for our own
binaries.  This can be faked, but the user can lie so nothing
lost.  There's nothing magic about MD4; other ports can use
anything that prodcues a long apparently random string we can
match against.

- new option --bidshow for us to get the MD4 of a
  released binary so I can add it to the website.
  Only available in wizard mode and not in nethack.6.
- typo macos -> macosx in hints file

No support for packaging builds as I'm not sure what that
would look like.

Adds a javascript helper for MacOS.
Adds a lua helper for linux (and builds and installs
 nhlua).

include/config.h

@@ -1,4 +1,4 @@
-/* NetHack 3.7	config.h	$NHDT-Date: 1610141601 2021/01/08 21:33:21 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.148 $ */
+/* NetHack 3.7	config.h	$NHDT-Date: 1693359531 2023/08/30 01:38:51 $  $NHDT-Branch: keni-crashweb2 $:$NHDT-Revision: 1.175 $ */
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /*-Copyright (c) Robert Patrick Rankin, 2016. */
 /* NetHack may be freely redistributed.  See license for details. */
@@ -205,6 +205,10 @@
  *            The following options pertain to crash reporting:
  *              GREPPATH     (the path to the system grep(1) utility)
  *              GDBPATH      (the path to the system gdb(1) program)
+ *              CRASHREPORT  (use CRASHREPORTURL if defined in syscf; this
+ *                           define specifies the name of the helper program
+ *                           used to launch the browser and enables the
+ *                           feature))
  *            Regular nethack options can also be specified in order to
  *            provide system-wide default values local to your system:
  *              OPTIONS      (same as in users' .nethackrc or defaults.nh)
@@ -235,6 +239,17 @@
 #define GREPPATH "/bin/grep"
 #endif
 
+#ifndef CRASHREPORT
+# ifdef MACOS
+    /* NB: This needs to be a full path unless it's in the playground. */
+//#define CRASHREPORT "NetHackCrashReport.JavaScript"
+# endif
+# ifdef __linux__
+    /* NB: This expects to find the nhlua binary as "./nhlua" */
+//#define CRASHREPORT "nhcrashreport.lua"
+# endif
+#endif
+
 /* note: "larger" is in comparison with 'record', the high-scores file
    (whose name can be overridden via #define in global.h if desired) */
 #define LOGFILE  "logfile"  /* larger file for debugging purposes */