Modules compatibility: http2.

HTTP/2-specific fields in structures are now available unconditionally.
Removed NGX_HTTP_V2 from the signature accordingly.

src/core/ngx_module.h

diff --git a/src/core/ngx_module.h b/src/core/ngx_module.h
index 3ac1e43..e2fbe9c 100644
--- a/src/core/ngx_module.h
+++ b/src/core/ngx_module.h
@@ -158,11 +158,7 @@
 #define NGX_MODULE_SIGNATURE_24  "0"
 #endif
 
-#if (NGX_HTTP_V2)
 #define NGX_MODULE_SIGNATURE_25  "1"
-#else
-#define NGX_MODULE_SIGNATURE_25  "0"
-#endif
 
 #if (NGX_HTTP_GZIP)
 #define NGX_MODULE_SIGNATURE_26  "1"

src/http/ngx_http.h

diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index 19cb680..afab4f6 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -19,10 +19,7 @@
 typedef struct ngx_http_file_cache_s  ngx_http_file_cache_t;
 typedef struct ngx_http_log_ctx_s     ngx_http_log_ctx_t;
 typedef struct ngx_http_chunked_s     ngx_http_chunked_t;
-
-#if (NGX_HTTP_V2)
 typedef struct ngx_http_v2_stream_s   ngx_http_v2_stream_t;
-#endif
 
 typedef ngx_int_t (*ngx_http_header_handler_pt)(ngx_http_request_t *r,
     ngx_table_elt_t *h, ngx_uint_t offset);

src/http/ngx_http_core_module.h

diff --git a/src/http/ngx_http_core_module.h b/src/http/ngx_http_core_module.h
index fb391d7..a8013b1 100644
--- a/src/http/ngx_http_core_module.h
+++ b/src/http/ngx_http_core_module.h
@@ -68,9 +68,7 @@
 #if (NGX_HTTP_SSL)
     unsigned                   ssl:1;
 #endif
-#if (NGX_HTTP_V2)
     unsigned                   http2:1;
-#endif
 #if (NGX_HAVE_INET6 && defined IPV6_V6ONLY)
     unsigned                   ipv6only:1;
 #endif
@@ -237,9 +235,7 @@
 #if (NGX_HTTP_SSL)
     unsigned                   ssl:1;
 #endif
-#if (NGX_HTTP_V2)
     unsigned                   http2:1;
-#endif
     unsigned                   proxy_protocol:1;
 };
 

src/http/ngx_http_request.h

diff --git a/src/http/ngx_http_request.h b/src/http/ngx_http_request.h
index e4a1cf0..ee609ad 100644
--- a/src/http/ngx_http_request.h
+++ b/src/http/ngx_http_request.h
@@ -286,9 +286,7 @@
     ngx_chain_t                      *bufs;
     ngx_buf_t                        *buf;
     off_t                             rest;
-#if (NGX_HTTP_V2)
     off_t                             received;
-#endif
     ngx_chain_t                      *free;
     ngx_chain_t                      *busy;
     ngx_http_chunked_t               *chunked;
@@ -438,9 +436,7 @@
     ngx_uint_t                        err_status;
 
     ngx_http_connection_t            *http_connection;
-#if (NGX_HTTP_V2)
     ngx_http_v2_stream_t             *stream;
-#endif
 
     ngx_http_log_handler_pt           log_handler;