[OE-core] [PATCH] devtool/standard.py: Enable perf to be buildable

[Saul Wold]

Perf is a tool build from the kernel source, which is normally available
in /work-shared/..., but when devtool is used to modify the kernel
source code, perf is not buildable since it gets an error about being unable
to add a depends to a non-exisit task do_patch.

This patch removes do_patch from the SRCTREECOVEREDTASKS and creates an empty
do_patch task to enable the VarFlags code to have someplace to attach depends
information to.

[YOCT #11120]

Signed-off-by: Saul Wold <sgw at linux.intel.com>
---
 scripts/lib/devtool/standard.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/lib/devtool/standard.py b/scripts/lib/devtool/standard.py
index 5ff1e23..2ecef99 100644
--- a/scripts/lib/devtool/standard.py
+++ b/scripts/lib/devtool/standard.py
@@ -842,7 +842,10 @@ def modify(args, config, basepath, workspace):
 
             if bb.data.inherits_class('kernel', rd):
                 f.write('SRCTREECOVEREDTASKS = "do_validate_branches do_kernel_checkout '
-                        'do_fetch do_unpack do_patch do_kernel_configme do_kernel_configcheck"\n')
+                        'do_fetch do_unpack do_kernel_configme do_kernel_configcheck"\n')
+                f.write('\ndo_patch() {\n'
+                        '    :\n'
+                        '}\n')
                 f.write('\ndo_configure_append() {\n'
                         '    cp ${B}/.config ${S}/.config.baseline\n'
                         '    ln -sfT ${B}/.config ${S}/.config.new\n'
-- 
2.7.4