Don't commit the value of CMAKE_INSTALL_PREFIX to the cache repeatedly

Author: rpavlik

CMakeLists.txt

@@ -28,11 +28,11 @@ SET(LIB_SUFFIX "" CACHE STRING "Optional arch-dependent suffix for the library i
 
 SET(RUNTIME_INSTALL_DIR bin
     CACHE PATH "Install dir for executables and dlls")
-SET(ARCHIVE_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}
+SET(ARCHIVE_INSTALL_DIR lib${LIB_SUFFIX}
     CACHE PATH "Install dir for static libraries")
-SET(LIBRARY_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/lib${LIB_SUFFIX}
+SET(LIBRARY_INSTALL_DIR lib${LIB_SUFFIX}
     CACHE PATH "Install dir for shared libraries")
-SET(INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_PREFIX}/include/jsoncpp
+SET(INCLUDE_INSTALL_DIR include/jsoncpp
     CACHE PATH "Install dir for headers")
 SET(PACKAGE_INSTALL_DIR lib${LIB_SUFFIX}/cmake
     CACHE PATH "Install dir for cmake package config files")