do not create Win32 drive letter in ngx_create_full_path()

src/core/ngx_file.c

diff --git a/src/core/ngx_file.c b/src/core/ngx_file.c
index 45bb4ca..b93a209 100644
--- a/src/core/ngx_file.c
+++ b/src/core/ngx_file.c
@@ -183,7 +183,13 @@
     u_char     *p, ch;
     ngx_err_t   err;
 
-    for (p = dir + 1; *p; p++) {
+#if (NGX_WIN32)
+    p = dir + 3;
+#else
+    p = dir + 1;
+#endif
+
+    for ( /* void */ ; *p; p++) {
         ch = *p;
 
         if (ch != '/') {