travis-ci: removed the env LUA_CMODULE_DIR=/lib which caused problems.

Author: agentzh

.travis.yml

@@ -20,7 +20,6 @@ env:
     - LD_LIBRARY_PATH=$LUAJIT_LIB:$LD_LIBRARY_PATH
     - LUAJIT_INC=$LUAJIT_PREFIX/include/luajit-2.1
     - LUA_INCLUDE_DIR=$LUAJIT_INC
-    - LUA_CMODULE_DIR=/lib
     - PCRE_VER=8.33
     - PCRE_PREFIX=/opt/pcre
     - PCRE_LIB=$PCRE_PREFIX/lib