BUILD: travis-ci: TFO and GETADDRINFO are now enabled by default

This default changed in the linux-glibc target with commits 364d6f5
and a26181e.
diff --git a/.travis.yml b/.travis.yml
index fca839b..c1d7b2d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@
 
 env:
   global:
-    - FLAGS="USE_ZLIB=1 USE_PCRE=1 USE_PCRE_JIT=1 USE_LUA=1 USE_OPENSSL=1 USE_GETADDRINFO=1 USE_TFO=1 USE_SYSTEMD=1 USE_WURFL=1 WURFL_INC=contrib/wurfl WURFL_LIB=contrib/wurfl USE_DEVICEATLAS=1 DEVICEATLAS_SRC=contrib/deviceatlas USE_51DEGREES=1"
+    - FLAGS="USE_ZLIB=1 USE_PCRE=1 USE_PCRE_JIT=1 USE_LUA=1 USE_OPENSSL=1 USE_SYSTEMD=1 USE_WURFL=1 WURFL_INC=contrib/wurfl WURFL_LIB=contrib/wurfl USE_DEVICEATLAS=1 DEVICEATLAS_SRC=contrib/deviceatlas USE_51DEGREES=1"
     - SSL_LIB=${HOME}/opt/lib
     - SSL_INC=${HOME}/opt/include
     - TMPDIR=/tmp