Merge pull request #24 from cwanda/1_2_0_adv

Fixed build error on Windows. Added BuildAdvertiser()
diff --git a/newtmgr/bll/bll_xports_windows.go b/newtmgr/bll/bll_xports_windows.go
index 093059a..a17ab6f 100644
--- a/newtmgr/bll/bll_xports_windows.go
+++ b/newtmgr/bll/bll_xports_windows.go
@@ -24,6 +24,7 @@
 import (
 	"fmt"
 
+	"mynewt.apache.org/newtmgr/nmxact/adv"
 	"mynewt.apache.org/newtmgr/nmxact/scan"
 	"mynewt.apache.org/newtmgr/nmxact/sesn"
 )
@@ -72,3 +73,7 @@
 func (bx *BllXport) Tx(data []byte) error {
 	return fmt.Errorf("BllXport.Tx() not supported")
 }
+
+func (bx *BllXport) BuildAdvertiser() (adv.Advertiser, error) {
+	return nil, fmt.Errorf("BllXport#Advertiser not supported")
+}