angstrom-version: fix when one layer is not handled by git

if one layer is not managed by git, we get :
meta-stagging     = "<unknown>:<unknown>"
and those < & > char lead to an error on do_install

Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

recipes-angstrom/angstrom/angstrom-version.bb

@@ -31,6 +31,8 @@ def get_layers(bb, d):
 			s1= layers_branch_rev[i][p1:]
 
 	layertext = "Configured Openembedded layers:\n%s\n" % '\n'.join(layers_branch_rev)
+	layertext = layertext.replace('<','')
+	layertext = layertext.replace('>','')
 	return layertext
 
 do_install() {