[OE-core] image.bbclass: No need to run most tasks except do_rootfs

[Richard Purdie]

Running fetch/unpack/patch/compile/install etc. is pointless
since the only image task that does anything is the rootfs task.

Hence mark the useless tasks as noexec so we don't bother running them.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 0b75dce..05f4331 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -315,4 +315,16 @@ rootfs_trim_schemas () {
 
 EXPORT_FUNCTIONS zap_root_password remove_init_link do_rootfs make_zimage_symlink_relative set_image_autologin rootfs_update_timestamp rootfs_no_x_startup
 
-addtask rootfs before do_build after do_install
+do_fetch[noexec] = "1"
+do_unpack[noexec] = "1"
+do_patch[noexec] = "1"
+do_configure[noexec] = "1"
+do_compile[noexec] = "1"
+do_install[noexec] = "1"
+do_populate_sysroot[noexec] = "1"
+do_package[noexec] = "1"
+do_package_write_ipk[noexec] = "1"
+do_package_write_deb[noexec] = "1"
+do_package_write_rpm[noexec] = "1"
+
+addtask rootfs before do_build