Revert "try with release type"

This reverts commit 95855557.

CMakeLists.txt

@@ -81,7 +81,6 @@ ENDIF()
 
 SET(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} -fPIC -O2 --param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security -Wall -std=c++11 ")
 
-SET(CMAKE_BUILD_TYPE Release)
 IF (DEBUG)
   SET(CMAKE_VERBOSE_MAKEFILE 1)
   SET(CMAKE_BUILD_TYPE Debug)