divide select module into two modules: Unix and Win32 ones

auto/os/win32

diff --git a/auto/os/win32 b/auto/os/win32
index c357a96..c4bcc6a 100644
--- a/auto/os/win32
+++ b/auto/os/win32
@@ -10,6 +10,7 @@
 OS_CONFIG="$WIN32_CONFIG"
 CORE_LIBS="$CORE_LIBS advapi32.lib ws2_32.lib"
 NGX_ICONS="$NGX_WIN32_ICONS"
+SELECT_SRCS=$WIN32_SELECT_SRCS
 
 EVENT_MODULES="$EVENT_MODULES $IOCP_MODULE"
 EVENT_FOUND=YES

auto/sources

diff --git a/auto/sources b/auto/sources
index 319026b..e4649b0 100644
--- a/auto/sources
+++ b/auto/sources
@@ -95,6 +95,7 @@
 
 SELECT_MODULE=ngx_select_module
 SELECT_SRCS=src/event/modules/ngx_select_module.c
+WIN32_SELECT_SRCS=src/event/modules/ngx_win32_select_module.c
 
 POLL_MODULE=ngx_poll_module
 POLL_SRCS=src/event/modules/ngx_poll_module.c