Fix static and dynamic mode compilation with nginx >= 1.9.11

The commit 42eeda5 "Dynamic Module support." does not compile in
the static module mode on nginx >= 1.9.11. It gives the compiler error
message:

	objs/ngx_modules.o:(.data+0x320): undefined reference to
	`ngx_http_aws_auth'
	collect2: error: ld returned 1 exit status
	make[1]: *** [objs/nginx] Error 1
	make[1]: Leaving directory `/nginx-1.9.11'
	make: *** [install] Error 2

It is possible to fix static mode, by changing ngx_module_name to
"ngx_http_aws_auth_module", however, this breaks dynamic mode instead.

To make both modes work correctly, the name of the C source code file is
required to match the module struct name. And now both modes work
correctly.

Tested on nginx-1.9.11 and nginx-1.9.12.

Author: Ira W. Snyder

config

@@ -2,15 +2,15 @@ ngx_addon_name=ngx_http_aws_auth
 
 if test -n "$ngx_module_link"; then
     ngx_module_type=HTTP
-    ngx_module_name=ngx_http_aws_auth
+    ngx_module_name=ngx_http_aws_auth_module
     ngx_module_incs=
     ngx_module_deps=
-    ngx_module_srcs="$ngx_addon_dir/ngx_http_aws_auth.c"
+    ngx_module_srcs="$ngx_addon_dir/ngx_http_aws_auth_module.c"
     ngx_module_libs="$CORE_LIBS -lssl"
 
     . auto/module
 else
    HTTP_MODULES="$HTTP_MODULES ngx_http_aws_auth_module"
-   NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_aws_auth.c"
+   NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_aws_auth_module.c"
    CORE_LIBS="$CORE_LIBS -lssl"
-fi
+fi