don't unconditionally require bsh.jar and js.jar in RepositoryExternal.mk

... as they can be disabled and thus are not there at install

Change-Id: I197b5053971d2721114b2ebc7b3c31db36c3f58e

RepositoryExternal.mk

@@ -3181,6 +3181,8 @@ endef
 endif # SYSTEM_HSQLDB
 
 
+ifeq ($(ENABLE_SCRIPTING_BEANSHELL),TRUE)
+
 ifneq ($(SYSTEM_BSH),)
 
 define gb_Jar__use_bsh
@@ -3201,6 +3203,9 @@ endef
 
 endif # SYSTEM_BSH
 
+endif
+
+ifeq ($(ENABLE_SCRIPTING_JAVASCRIPT),TRUE)
 
 ifneq ($(SYSTEM_RHINO),)
 
@@ -3222,6 +3227,8 @@ endef
 
 endif # SYSTEM_RHINO
 
+endif
+
 ifneq ($(SYSTEM_APACHE_COMMONS),)
 
 define gb_Jar__use_commons-codec