* *.c: Finish replacing K&R style prototypes with ANSI C

prototypes.

* eval.c: Make scm_m_mody's 3rd argument be a const char *, not a
char *.  ANSI prototypes caught this.

* strorder.c: Use GUILE_PROC1 for the couple SCM_PROC1 expansions
that I missed.

* scm_validate.h: Use SCM_BOOLP for validating bools.  Do not
expand macros if SCM_DOCSTRING_SNARF.

libguile/backtrace.c

@@ -106,10 +106,7 @@ display_header (SCM source, SCM port)
 
 
 void
-scm_display_error_message (message, args, port)
-     SCM message;
-     SCM args;
-     SCM port;
+scm_display_error_message (SCM message, SCM args, SCM port)
 {
   int writingp;
   char *start;