build: use find -perm /mode, instead of -perm +mode STRIP_FIND_CMD

The -perm +mode is deprecated, and sometimes yields suprising results.
It can be confused with permission in symbolic mode, for example '+u+g',
as POSIX spec suggests.

Signed-off-by: Tzu-Jung Lee <tjlee@ambarella.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Makefile

@@ -449,7 +449,7 @@ STRIP_FIND_CMD = find $(TARGET_DIR)
 ifneq (,$(call qstrip,$(BR2_STRIP_EXCLUDE_DIRS)))
 STRIP_FIND_CMD += \( $(call finddirclauses,$(TARGET_DIR),$(call qstrip,$(BR2_STRIP_EXCLUDE_DIRS))) \) -prune -o
 endif
-STRIP_FIND_CMD += -type f -perm +111
+STRIP_FIND_CMD += -type f -perm /111
 STRIP_FIND_CMD += -not \( $(call findfileclauses,libpthread*.so* $(call qstrip,$(BR2_STRIP_EXCLUDE_FILES))) \) -print
 
 target-finalize: