refator: moved OCSP related FFI C API functions from ngx_http_lua_ssl_certby.c to a separate compilation unit, ngx_http_lua_ssl_ocscp.c.

Author: agentzh

.gitignore

@@ -154,6 +154,7 @@ src/timer.[ch]
 src/config.[ch]
 src/worker.[ch]
 src/certby.[ch]
+src/ocsp.c
 src/lex.[ch]
 src/balancer.[ch]
 src/semaphore.[ch]

config

@@ -352,6 +352,7 @@ NGX_ADDON_SRCS="$NGX_ADDON_SRCS \
                 $ngx_addon_dir/src/ngx_http_lua_config.c \
                 $ngx_addon_dir/src/ngx_http_lua_worker.c \
                 $ngx_addon_dir/src/ngx_http_lua_ssl_certby.c \
+                $ngx_addon_dir/src/ngx_http_lua_ssl_ocsp.c \
                 $ngx_addon_dir/src/ngx_http_lua_lex.c \
                 $ngx_addon_dir/src/ngx_http_lua_balancer.c \
                 "