Update comments in tests/Makefile.am

tests/Makefile.am

@@ -4,6 +4,8 @@
 # AUTOMAKE_OPTIONS = dejagnu
 # DEJATOOL = testfreq testbcd testloc rigctl
 
+# For some reason this "if" is not working -- rigtestlibusb is still being included
+# Fix for now is to change rigtestlibusb.c instead
 if HAVE_LIBUSB
     TESTLIBUSB = rigtestlibusb
 else