PCRE: retain input pattern for all regular expressions.
PCRE: retain input pattern for all regular expressions.

Previously, input pattern was kept only for regular expressions
with named captures, which resulted in error log entries without
input pattern for PCRE errors that occured while processing
regular expressions without them.

Signed-off-by: Piotr Sikora <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@cloudflare.com>

hy0kl/nginx,firebase/nginx,hy0kl/nginx,firebase/nginx,firebase/nginx,firebase/nginx,hy0kl/nginx