roken: Export more snprintf symbols

Export more of the snprintf symbols from librokenafs, so that we
can actually make use of them.

Change-Id: Ida347c516bec6444d26d0e148ffd781999f0b364
Reviewed-on: http://gerrit.openafs.org/3609
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>

src/roken/afsroken.def

@@ -31,4 +31,5 @@ EXPORTS
         rk_optind               @35 DATA
         rk_opterr               @36 DATA
 	rk_mkstemp		@37
+	rk_asnprintf		@38
 

src/roken/librokenafs.map

@@ -11,6 +11,8 @@
 		issuid;
 		net_read;
 		net_write;
+		rk_asnprintf;
+		rk_asprintf;
 		rk_cloexec;
 		rk_cloexec_file;
 		rk_ecalloc;
@@ -19,12 +21,16 @@
 		rk_hex_encode;
 		rk_mkstemp;
 		rk_print_version;
+		rk_snprintf;
 		rk_socket;
 		rk_strcasecmp;
 		rk_strlcat;
 		rk_strnlen;
 		rk_strlcpy;
 		rk_strsep;
+		rk_vasprintf;
+		rk_vasnprintf;
+	        rk_vsnprintf;
 		strcasecmp;
 		verr;
 		verrx;