package: Add INHIBIT_PACKAGE_STRIP_FILES to allow files to remain unstripped
There are cases where its useful to allow only a select few files
to be excluded from the package stripping mechanism. Currently
this isn't possible so add a variable to allow this.
This is to be used sparingly as in general the core code should be
doing the right thing. This is better than the alternative of leaving the whole
package unstripped.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
