Don't strip *.go files

as those may be Guile object files. Those are ELF files but cannot be
stripped. This may also exclude other files (like Golang sources) but
that should not be an issue.

Resolves: rpm-software-management#1765
(cherry picked from commit ee5d150)

scripts/brp-strip

@@ -13,5 +13,5 @@ Darwin*) exit 0 ;;
 esac
 
 # Strip ELF binaries
-find "$RPM_BUILD_ROOT" -type f \! -regex "${RPM_BUILD_ROOT}/*usr/lib/debug.*" \! -name "*.ko" -print0 | \
+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