devel/libcbor: fix strict prototype warnings with clang 15

During an exp-run for llvm 15 (see bug 265425), it turned out that
security/libfido2 failed to build with clang 15:

  In file included from /wrkdirs/usr/ports/security/libfido2/work/libfido2-1.12.0/src/aes256.c:8:
  In file included from /wrkdirs/usr/ports/security/libfido2/work/libfido2-1.12.0/src/fido.h:42:
  In file included from /usr/local/include/cbor.h:14:
  /usr/local/include/cbor/arrays.h:100:51: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
  CBOR_EXPORT cbor_item_t* cbor_new_indefinite_array();
                                                    ^
                                                     void
  In file included from /wrkdirs/usr/ports/security/libfido2/work/libfido2-1.12.0/src/aes256.c:8:
  In file included from /wrkdirs/usr/ports/security/libfido2/work/libfido2-1.12.0/src/fido.h:42:
  In file included from /usr/local/include/cbor.h:15:
  /usr/local/include/cbor/bytestrings.h:107:54: error: a function declaration without a prototype is deprecated in all versions of C [-Werror,-Wstrict-prototypes]
  CBOR_EXPORT cbor_item_t *cbor_new_definite_bytestring();
                                                       ^
                                                        void

And many more of these -Werror warnings, all due to declarations in
libcbor's headers. These are triggered because functions taking no
parameters should be declared with "(void)", not "()".

I would like to propose to fix the problem on the libcbor side, by
editing the declarations and definitions of such functions in the port
Makefile. This cleans up all warnings in devel/libcbor, and also fixes
security/libfido2 as a consequence.

PR:		268417
Approved by:	maintainer timeout (2 weeks)
MFH:		2022Q4

devel/libcbor/Makefile

@@ -24,5 +24,7 @@ USE_GITHUB=	yes
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|-flto||; /subdirs(examples)/d' ${WRKSRC}/CMakeLists.txt
+	@${REINPLACE_CMD} -e 's|();|(void);|' ${WRKSRC}/src/cbor/*.h ${WRKSRC}/src/cbor/internal/*.h
+	@${REINPLACE_CMD} -e 's|() {|(void) {|' ${WRKSRC}/src/cbor/*.c ${WRKSRC}/src/cbor/internal/*.c
 
 .include <bsd.port.mk>