rtl-sdr: update to latest

Signed-off-by: Roger D <rogerdammit@gmail.com>

utils/rtl-sdr/Makefile

@@ -7,14 +7,18 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rtl-sdr
-PKG_VERSION:=2014-02-10
-PKG_RELEASE:=$(PKG_SOURCE_VERSION)
+PKG_VERSION:=0.5.3-20150608-$(PKG_SOURCE_VERSION)
+PKG_RELEASE:=1
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=git://git.osmocom.org/rtl-sdr.git
+PKG_SOURCE_VERSION:=e3c03f738f5aef4dc51e2b741fbdb542b9cc1bb1
+
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
-PKG_SOURCE_VERSION:=6ee557360645da158e3065111349c318894b497b
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.gz
+PKG_SOURCE:=$(PKG_SOURCE_SUBDIR).tar.gz
+PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_SOURCE_SUBDIR)
+PKG_BUILD_PARALLEL:=1
+
 CMAKE_INSTALL:=1
 
 PKG_LICENSE:=GPLv2