CMAKE - Force INSTALL_LIBDIR to be lib

On some systems it defaults to lib64, on others to lib.

Change-Id: I973b488253d106ded518ee590a0edb370927f9a4
Signed-off-by: Galantsev, Dmitrii <dmitrii.galantsev@amd.com>

CMakeLists.txt

@@ -16,6 +16,12 @@ set(BUILD_SHARED_LIBS
 set(CMAKE_MODULE_PATH
     "${CMAKE_CURRENT_SOURCE_DIR}/cmake_modules/"
     CACHE INTERNAL "Default module path.")
+
+# Default libdir to "lib", this skips GNUInstallDirs from trying to take a guess if it's unset
+set(CMAKE_INSTALL_LIBDIR
+    "lib"
+    CACHE STRING "Library install directory")
+
 ## Include common cmake modules
 include(utils)
 include(help_package)