per bug 828, bump boa package to v0.94.14rc21

package/boa/boa.mk

@@ -4,7 +4,7 @@
 #
 #############################################################
 
-BOA_VERSION=0.94.14rc20
+BOA_VERSION=0.94.14rc21
 
 # Don't alter below this line unless you (think) you know
 # what you are doing! Danger, Danger!