Remove NETDATA_WITH_UUID def because it's not used anywhere. (#12044)

configure.ac

@@ -405,7 +405,6 @@ PKG_CHECK_MODULES(
     [have_uuid=yes],
     [AC_MSG_ERROR([libuuid required but not found. Try installing 'uuid-dev' or 'libuuid-devel'.])]
 )
-AC_DEFINE([NETDATA_WITH_UUID], [1], [uuid usability])
 OPTIONAL_UUID_CFLAGS="${UUID_CFLAGS}"
 OPTIONAL_UUID_LIBS="${UUID_LIBS}"