Configure: rebuild perl module nginx.so if headers are changed.

Note: the "-p" argument of cp(1) dropped intentionally, to force nginx.so
rebuild.  It is considered too boring to properly list all dependencies
in Makefile.PL.

auto/lib/perl/make

@@ -6,11 +6,12 @@
 cat << END                                                    >> $NGX_MAKEFILE
 
 $NGX_OBJS/src/http/modules/perl/blib/arch/auto/nginx/nginx.so:		\
+		\$(CORE_DEPS) \$(HTTP_DEPS)				\
 		src/http/modules/perl/nginx.pm				\
 		src/http/modules/perl/nginx.xs				\
 		src/http/modules/perl/ngx_http_perl_module.h		\
 		$NGX_OBJS/src/http/modules/perl/Makefile
-	cp -p src/http/modules/perl/nginx.* $NGX_OBJS/src/http/modules/perl/
+	cp src/http/modules/perl/nginx.* $NGX_OBJS/src/http/modules/perl/
 
 	cd $NGX_OBJS/src/http/modules/perl && \$(MAKE)