fix a typo in Makefile.am

src/Makefile.am

@@ -8,7 +8,7 @@ AM_CFLAGS = -fPIC -Wall
 lib_LTLIBRARIES = librtlsdr.la
 
 librtlsdr_la_SOURCES = rtl-sdr.c tuner_e4k.c tuner_fc0012.c tuner_fc0013.c tuner_fc2580.c
-librtlsdr_la_LDFALGS = -version-info $(LIBVERSION)
+librtlsdr_la_LDFLAGS = -version-info $(LIBVERSION)
 
 bin_PROGRAMS         = rtl_sdr rtl_tcp