dump1090: fix librtlsdr package name typo

Fixes:
http://autobuild.buildroot.net/results/720/720a4b23a47aa6677bde4418f21e6b073a72ea51/
http://autobuild.buildroot.net/results/14e/14edf051d113a6ec54b61738748764adeac7ba9d/

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dump1090/Config.in

@@ -1,7 +1,7 @@
 config BR2_PACKAGE_DUMP1090
 	bool "dump1090"
 	depends on BR2_TOOLCHAIN_HAS_THREADS # librtlsdr
-	select BR2_PACKAGE_LIBSRTLSDR
+	select BR2_PACKAGE_LIBRTLSDR
 	help
 	  Dump1090 is a simple Mode S decoder for RTLSDR devices