Merge pull request #1731 from luke-jr/opt_ipv6

Optional IPv6 spaces cleanup

bitcoin-qt.pro

@@ -75,12 +75,12 @@ contains(FIRST_CLASS_MESSAGING, 1) {
 #  or: qmake "USE_IPV6=0" (disabled by default)
 #  or: qmake "USE_IPV6=-" (not supported)
 contains(USE_IPV6, -) {
-	message(Building without IPv6 support)
+    message(Building without IPv6 support)
 } else {
-	count(USE_IPV6, 0) {
+    count(USE_IPV6, 0) {
-		USE_IPV6=1
+        USE_IPV6=1
-	}
+    }
-	DEFINES += USE_IPV6=$$USE_IPV6
+    DEFINES += USE_IPV6=$$USE_IPV6
 }
 
 contains(BITCOIN_NEED_QT_PLUGINS, 1) {