package.bbclass: Fix missing debug src files

The previous change used egrep instead of fgrep.  We need to use fgrep because
there are expression like syntaxes in some file names, we need exact matches.

(From OE-Core rev: 0de88dc9aa30f29ec1ab5cc0c541c8be859392ab)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/package.bbclass

@@ -233,7 +233,7 @@ def splitfile2(debugsrcdir, d):
        processdebugsrc =  "LC_ALL=C ; sort -z -u '%s' | egrep -v -z '(<internal>|<built-in>)$' | "
        # We need to ignore files that are not actually ours
        # we do this by only paying attention to items from this package
-       processdebugsrc += "egrep -z '%s' | "
+       processdebugsrc += "fgrep -z '%s' | "
        processdebugsrc += "(cd '%s' ; cpio -pd0mL '%s%s' 2>/dev/null)"
 
        os.system(processdebugsrc % (sourcefile, workbasedir, workparentdir, dvar, debugsrcdir))