Fix setting of ARCH_INDEPENDENT based on INTERFACE_LIBRARY property (#39)

If PROJECT_ARCH_INDEPENDENT is not set by the user, PackageProject
will attempt to set this automatically depending on whether the target
is an INTERFACE_LIBRARY or not.

However, this auto-detection currently does not work due to an error in
the CMake logic.

Author: salman-javed-nz

CMakeLists.txt

@@ -108,7 +108,7 @@ function(packageProject)
   set(wbpvf_extra_args "")
   if(NOT DEFINED PROJECT_ARCH_INDEPENDENT)
     get_target_property(target_type "${PROJECT_NAME}" TYPE)
-    if(TYPE STREQUAL "INTERFACE_LIBRARY")
+    if(target_type STREQUAL "INTERFACE_LIBRARY")
       set(PROJECT_ARCH_INDEPENDENT YES)
     endif()
   endif()