Give the internal match function some const/restrict hints.

src/vmod_pcre2.c

@@ -553,8 +553,10 @@ compile(VRT_CTX, pcre2_compile_context * restrict const cctx,
 }
 
 static inline VCL_BOOL
-match(VRT_CTX, pcre2_code *code, VCL_STRING subject, VCL_INT len,
-      uint32_t options, pcre2_match_data *mdata, pcre2_match_context *mctx,
+match(VRT_CTX, pcre2_code * restrict const code,
+      VCL_STRING restrict const subject, VCL_INT len, const uint32_t options,
+      pcre2_match_data * restrict const mdata,
+      pcre2_match_context * restrict const mctx,
       const char * restrict const context, const char * restrict const caller)
 {
 	PCRE2_SPTR safe_subject;