fixed segfault on windows for nginx-1.17.x ~ nginx-1.23.2

[chobits]

try to fix #68

skip ngx_http_process_request_uri for CONNECT request

[chobits]

Note that only nginx-1.17.x ~ nginx-1.23.2 have been fixed. Their corresponding patch is proxy_connect_rewrite_1018.patch and proxy_connect_rewrite_102101.patch.

[chobits]

segfault details：

enable NGX_WIN32 macro to trigger sigfault in gdb:

Program received signal SIGSEGV, Segmentation fault.                       
 ngx_http_process_request_uri (r=r@entry=0x56203f79da80)                         at src/http/ngx_http_request.c:1346                                     1346            if (*p == ' ') {                                            (gdb) bt                                                                    #0  ngx_http_process_request_uri (r=r@entry=0x56203f79da80)
    at src/http/ngx_http_request.c:1346
#1  0x000056203d7d616f in ngx_http_process_request_line (
    rev=rev@entry=0x56203f7e2a40) at src/http/ngx_http_request.c:1103
#2  0x000056203d7d6664 in ngx_http_wait_request_handler (
    rev=0x56203f7e2a40) at src/http/ngx_http_request.c:501
#3  0x000056203d7b9b8d in ngx_epoll_process_events (cycle=0x56203f7a2c60,
    timer=<optimized out>, flags=<optimized out>)
    at src/event/modules/ngx_epoll_module.c:901

(gdb) p p                                                                   
$17 = (u_char *) 0xffffffffffffffff <error: Cannot access memory at address 0xffffffffffffffff>
(gdb) f 0
#0  ngx_http_process_request_uri (r=r@entry=0x56203f79da80)
    at src/http/ngx_http_request.c:1346
1346            if (*p == ' ') {
(gdb) l
1341
1342        p = r->uri.data + r->uri.len - 1;
1343
1344        while (p > r->uri.data) {
1345
1346            if (*p == ' ') {