[PATCH v3] perf: Correct the substitution of python shebangs

[<zhe.he@windriver.com>]

From: He Zhe <zhe.he@windriver.com>

To make the native python3 is always used,

- Use sed one-liner instead
- Add substitution for ${S}/scripts/bpf_helpers_doc.py to fix the
  following warning.

File "/usr/lib/python3.6/sysconfig.py", line 421, in _init_posix
_temp = __import__(name, globals(), locals(), ['build_time_vars'], 0)
ModuleNotFoundError: No module named '_sysconfigdata'

This issue is first reported by Joel Stanley <joel@jms.id.au>
The sed one-liner is credited to Anuj Mittal <anuj.mittal@intel.com>

Signed-off-by: He Zhe <zhe.he@windriver.com>
---
 meta/recipes-kernel/perf/perf.bb | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/meta/recipes-kernel/perf/perf.bb b/meta/recipes-kernel/perf/perf.bb
index 6d1b06693d..a6fb51d3db 100644
--- a/meta/recipes-kernel/perf/perf.bb
+++ b/meta/recipes-kernel/perf/perf.bb
@@ -239,11 +239,8 @@ do_configure_prepend () {
     fi
 
     # use /usr/bin/env instead of version specific python
-    for s in `find ${S}/tools/perf/ -name '*.py'`; do
-        sed -i 's,/usr/bin/python,/usr/bin/env python3,' "${s}"
-        sed -i 's,/usr/bin/python2,/usr/bin/env python3,' "${s}"
-        sed -i 's,/usr/bin/env python2,/usr/bin/env python3,' "${s}"
-        sed -i 's,/usr/bin/python3,/usr/bin/env python3,' "${s}"
+    for s in `find ${S}/tools/perf/ -name '*.py'` ${S}/scripts/bpf_helpers_doc.py; do
+        sed -i -e "s,#!.*python.*,#!${USRBINPATH}/env python3," ${s}
     done
 
     # unistd.h can be out of sync between libc-headers and the captured version in the perf source
-- 
2.24.1