[#36] Removed testing and C API targets and changed used library to the C++ specific

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

config/lib/SPIRV_Cross.cmake

 find_package(spirv_cross_c_shared QUIET)
 
 if (spirv-cross_FOUND)
-    list(APPEND vkcv_libraries spirv_cross_c_shared)
+    list(APPEND vkcv_libraries spirv-cross-cpp)
 
-    message(${vkcv_config_msg} " SPIRV Cross    - ")
+    message(${vkcv_config_msg} " SPIRV Cross    - " ${SPIRV_CROSS_VERSION})
 else()
     if (EXISTS "${vkcv_lib_path}/SPIRV-Cross")
+        set(SPIRV_CROSS_CLI OFF CACHE INTERNAL "")
+        set(SPIRV_CROSS_ENABLE_TESTS OFF CACHE INTERNAL "")
+        set(SPIRV_CROSS_ENABLE_C_API OFF CACHE INTERNAL "")
+        set(SPIRV_CROSS_SKIP_INSTALL ON CACHE INTERNAL "")
+    
         add_subdirectory(${vkcv_lib}/SPIRV-Cross)
 
-        list(APPEND vkcv_libraries spirv_cross_c_shared)
+        list(APPEND vkcv_libraries spirv-cross-cpp)
 
-        message(${vkcv_config_msg} " SPIRV Cross    - ")
+        message(${vkcv_config_msg} " SPIRV Cross    - " ${SPIRV_CROSS_VERSION})
     else()
         message(WARNING "SPIRV-Cross is required..! Update the submodules!")
     endif ()