Fix assumed return type of MSVC

Wenfeng CAI

2018-11-13 a0b74b09a5824d50613e3b3a5590e7a9ed515716

 src/library/CMakeLists.txt

@@ -1,10 +1,6 @@
IF(WIN32)
    add_subdirectory("os/win")
ELSE(WIN32)
    add_subdirectory("os/linux")    
ENDIF(WIN32)
add_subdirectory("base") 
add_subdirectory("ini")   
add_subdirectory("os")
add_subdirectory("base")
add_subdirectory("ini")

ADD_LIBRARY(license++_static STATIC
    license++.cpp