gs1/gs1_lint: update to latest gs1-syntax-dictionary, removing

`iso3166list` linter and adjusting all others to allow for
  multiple optional linters (by checking `data_len` vs `offset`)
library: change invalid `input_mode` reset to return warning;
  split func table into 2 - func declarations without prototype
  will be error in C23;
  make invalid symbology check a separate function using a table
  and call near beginning of `ZBarcode_Encode_Segs()`;
  in `ZBarcode_BarcodeName()` save some bytes by simplifying
  name table and removing "BARCODE_" prefix from entries
output: fix pack logic to use pragma by default (actually more
  portable than `__attribute__`)
common.h: remove C99 detection which was artifice of specifying
  "-std=", and rejig layout to be more logical
BWIPP: update to latest version
general: change `ZINT_VERSION_BUILD` tests to `#if`s
general: further fiddling with some tables to save a few bytes
CLI: change function arg `optarg` -> `arg` so doesn't shadow
  global
general: library now compilable with Comp Cert C (though as it
  doesn't support `alloca()` will have multiple memory leaks)

backend/zint.h

@@ -459,7 +459,7 @@ extern "C" {
     ZINT_EXTERN int ZBarcode_ValidID(int symbol_id);
 
     /* Copy BARCODE_XXX name of `symbol_id` into `name` buffer, NUL-terminated.
-       Returns 0 if valid, non-zero (1 or -1) if not valid */
+       Returns 0 if valid, 1 if not valid */
     ZINT_EXTERN int ZBarcode_BarcodeName(int symbol_id, char name[32]);
 
     /* Return the capability flags for symbology `symbol_id` that match `cap_flag` */