Win32: fixed some warnings reported by Borland C.

Most notably, warning W8012 (comparing signed and unsigned values) reported
in multiple places where an unsigned value of small type (e.g., u_short) is
promoted to an int and compared to an unsigned value.

Warning W8072 (suspicious pointer arithmetic) disabled, it is reported
when we increment base pointer in ngx_shm_alloc().

src/core/ngx_resolver.c

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index f179b64..2065f75 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -780,7 +780,7 @@
 #endif
 
         if (rn->nsrvs) {
-            for (i = 0; i < rn->nsrvs; i++) {
+            for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) {
                 if (rn->u.srvs[i].name.data) {
                     ngx_resolver_free_locked(r, rn->u.srvs[i].name.data);
                 }
@@ -2959,7 +2959,7 @@
         ngx_del_timer(ctx->event);
     }
 
-    for (i = 0; i < rn->nsrvs; i++) {
+    for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) {
         srvs[i].name.data = ngx_resolver_alloc(r, rn->u.srvs[i].name.len);
         if (srvs[i].name.data == NULL) {
             goto failed;
@@ -4077,7 +4077,7 @@
 #endif
 
     if (rn->nsrvs) {
-        for (i = 0; i < rn->nsrvs; i++) {
+        for (i = 0; i < (ngx_uint_t) rn->nsrvs; i++) {
             if (rn->u.srvs[i].name.data) {
                 ngx_resolver_free_locked(r, rn->u.srvs[i].name.data);
             }
@@ -4206,10 +4206,10 @@
                 d = 0;
             }
 
-            if (j == rn->naddrs) {
+            if (j == (ngx_uint_t) rn->naddrs) {
                 j = 0;
             }
-        } while (++i < rn->naddrs);
+        } while (++i < (ngx_uint_t) rn->naddrs);
     }
 
 #if (NGX_HAVE_INET6)

src/http/modules/ngx_http_sub_filter_module.c

diff --git a/src/http/modules/ngx_http_sub_filter_module.c b/src/http/modules/ngx_http_sub_filter_module.c
index e8d1d80..de58c6f 100644
--- a/src/http/modules/ngx_http_sub_filter_module.c
+++ b/src/http/modules/ngx_http_sub_filter_module.c
@@ -645,7 +645,7 @@
 
         start = offset - (ngx_int_t) tables->min_match_len + 1;
 
-        i = ngx_max(tables->index[c], ctx->index);
+        i = ngx_max((ngx_uint_t) tables->index[c], ctx->index);
         j = tables->index[c + 1];
 
         while (i != j) {
@@ -978,7 +978,7 @@
         }
 
         c = match[i].match.data[tables->min_match_len - 1];
-        while (ch <= c) {
+        while (ch <= (ngx_uint_t) c) {
             tables->index[ch++] = (u_char) i;
         }
     }

src/http/ngx_http_file_cache.c

diff --git a/src/http/ngx_http_file_cache.c b/src/http/ngx_http_file_cache.c
index 3c8ad7d..a5a9300 100644
--- a/src/http/ngx_http_file_cache.c
+++ b/src/http/ngx_http_file_cache.c
@@ -553,7 +553,7 @@
         return NGX_DECLINED;
     }
 
-    if (h->crc32 != c->crc32 || h->header_start != c->header_start) {
+    if (h->crc32 != c->crc32 || (size_t) h->header_start != c->header_start) {
         ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
                       "cache file \"%s\" has md5 collision", c->file.name.data);
         return NGX_DECLINED;
@@ -1495,8 +1495,8 @@
     if (h.version != NGX_HTTP_CACHE_VERSION
         || h.last_modified != c->last_modified
         || h.crc32 != c->crc32
-        || h.header_start != c->header_start
-        || h.body_start != c->body_start)
+        || (size_t) h.header_start != c->header_start
+        || (size_t) h.body_start != c->body_start)
     {
         ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                        "http file cache \"%s\" content changed",

src/mail/ngx_mail_smtp_module.c

diff --git a/src/mail/ngx_mail_smtp_module.c b/src/mail/ngx_mail_smtp_module.c
index f03bd90..3b5a2d8 100644
--- a/src/mail/ngx_mail_smtp_module.c
+++ b/src/mail/ngx_mail_smtp_module.c
@@ -280,7 +280,7 @@
 
     p = ngx_cpymem(p, conf->capability.data, conf->capability.len);
 
-    p = ngx_cpymem(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
+    ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
 
     p = conf->starttls_capability.data
         + (last - conf->capability.data) + 3;

src/os/win32/ngx_win32_config.h

diff --git a/src/os/win32/ngx_win32_config.h b/src/os/win32/ngx_win32_config.h
index ecdf6ad..c5e26dc 100644
--- a/src/os/win32/ngx_win32_config.h
+++ b/src/os/win32/ngx_win32_config.h
@@ -119,6 +119,9 @@
 /* unreferenced formal parameter */
 #pragma warn -8057
 
+/* suspicious pointer arithmetic */
+#pragma warn -8072
+
 #endif