Stop emulating a space character after r->method_name.

This is an API change.

The proxy module was modified to not depend on this in 44122bddd9a1.
No known third-party modules seem to depend on this.
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 9946958..acb9c90 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -776,7 +776,7 @@
 };
 
 
-ngx_str_t  ngx_http_core_get_method = { 3, (u_char *) "GET " };
+ngx_str_t  ngx_http_core_get_method = { 3, (u_char *) "GET" };
 
 
 void
diff --git a/src/http/v2/ngx_http_v2.c b/src/http/v2/ngx_http_v2.c
index e77c13a..869ce08 100644
--- a/src/http/v2/ngx_http_v2.c
+++ b/src/http/v2/ngx_http_v2.c
@@ -3294,9 +3294,6 @@
 
     ngx_memcpy(p, ending, sizeof(ending));
 
-    /* some modules expect the space character after method name */
-    r->method_name.data = r->request_line.data;
-
     ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http2 http request line: \"%V\"", &r->request_line);