databases/kyotocabinet: add prototypes to kclangc.h declarations.

Some function declarations just use () as argument list. This is
valid C++, but not C, and clang-15 complains with -Wstrict-prototypes:

/usr/local/include/kclangc.h:261:13: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
double kcnan();
            ^
             void
/usr/local/include/kclangc.h:268:13: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
double kcinf();
            ^
             void
/usr/local/include/kclangc.h:1525:18: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
KCLIST* kclistnew();
                  ^
                   void

Add the missing void.

PR:		268313

databases/kyotocabinet/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	kyotocabinet
 PORTVERSION=	1.2.79
+PORTREVISION=	1
 CATEGORIES=	databases
 MASTER_SITES=	https://dbmx.net/kyotocabinet/pkg/ \
 		LOCAL/sunpoet

databases/kyotocabinet/files/patch-kclangc.h

@@ -0,0 +1,28 @@
+--- kclangc.h.orig	2020-12-18 02:48:28 UTC
++++ kclangc.h
+@@ -258,14 +258,14 @@ size_t kclevdist(const void* abuf, size_t asiz, const 
+  * Get the quiet Not-a-Number value.
+  * @return the quiet Not-a-Number value.
+  */
+-double kcnan();
++double kcnan(void);
+ 
+ 
+ /**
+  * Get the positive infinity value.
+  * @return the positive infinity value.
+  */
+-double kcinf();
++double kcinf(void);
+ 
+ 
+ /**
+@@ -1522,7 +1522,7 @@ typedef struct {
+  * @note The object of the return value should be released with the kclistdel function when it is
+  * no longer in use.
+  */
+-KCLIST* kclistnew();
++KCLIST* kclistnew(void);
+ 
+ 
+ /**