net-mgmt/ipv6calc: Fix build with Clang 15 and remove the workaround

libipv6calc_db_wrapper.c:2901:23: error: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Werror,-Wdeprecated-non-prototype]
                        ret = get_array_row(i, &value_first_00_31, &value_first_32_63, &value_last_00_31, &value_last_32_63);
                                           ^
1 error generated.

net-mgmt/ipv6calc/Makefile

@@ -20,13 +20,7 @@ GNU_CONFIGURE=	yes
 
 SHEBANG_FILES=	tools/*
 
-.include <bsd.port.pre.mk>
-
-.if ${OPSYS} == FreeBSD && ((${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000) || ${OSVERSION} >= 1400079)
-CFLAGS+=       -Wno-error=deprecated-non-prototype
-.endif
-
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/*
 
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>

net-mgmt/ipv6calc/files/patch-clang15

@@ -0,0 +1,11 @@
+--- databases/lib/libipv6calc_db_wrapper.c.orig	2023-06-12 07:11:54 UTC
++++ databases/lib/libipv6calc_db_wrapper.c
+@@ -2778,7 +2778,7 @@ long int libipv6calc_db_wrapper_get_entry_generic(
+ 	const uint32_t	lookup_key_00_31,	// lookup key MSB
+ 	const uint32_t	lookup_key_32_63,	// lookup key LSB
+ 	void            *data_ptr,		// pointer to DB data in case of IPV6CALC_DB_LOOKUP_DATA_PTR_TYPE_BDB, otherwise NULL
+-	int  (*get_array_row)()			// function to get array row
++	int  (*get_array_row)(int, uint32_t*, uint32_t*, uint32_t*, uint32_t*)		// function to get array row
+ 	) {
+
+ 	int retval = -1;