FS-7967 SmartOS compatibility

configure.ac: honor NetBSD and SmartOS in search for system lua
src/switch_utf8.c: remove switch_u8_vprintf and switch_u8_printf
replace u_int32_t with C99 standard uint32_t, and also the same for
  8,16,64 bit

libs/spandsp/tests/pcap_parse.c

@@ -113,7 +113,7 @@ typedef struct _null_hdr
 typedef struct _ipv6_hdr
 {
     char dontcare[6];
-    u_int8_t nxt_header; /* we only need the next header, so we can determine, if the next header is UDP or not */
+    uint8_t nxt_header; /* we only need the next header, so we can determine, if the next header is UDP or not */
     char dontcare2[33];
 } ipv6_hdr;
 #endif