Don't strip ELF files with "no machine"

as strip fails on them (if they are Guile object files).
This adds another layer of protection as *.go files are already filtered
out.

Resolves:  rpm-software-management#1765
(cherry picked from commit 3161ce3)

scripts/brp-strip

@@ -14,4 +14,4 @@ esac
 
 # Strip ELF binaries
 find "$RPM_BUILD_ROOT" -type f \! -regex "${RPM_BUILD_ROOT}/*usr/lib/debug.*" \! -name "*.ko" \! -name "*.go" -print0 | \
-    xargs -0 -r -P$NCPUS -n32 sh -c "file \"\$@\" | sed -n -e 's/^\(.*\):[ 	]*ELF.*, not stripped.*/\1/p' | xargs -I\{\} $STRIP -g \{\}" ARG0
+    xargs -0 -r -P$NCPUS -n32 sh -c "file \"\$@\" | sed -n -e 's/^\(.*\):[ 	]*ELF.*, not stripped.*/\1/p' | grep -v 'no machine' | xargs -I\{\} $STRIP -g \{\}" ARG0