message: Fix libshader build for Windows.
diff: @@ -64,8 +64,13 @@ if (DEFINED RESGEN_FLAGS)
  set_source_files_properties(${RESGEN_SOURCE} PROPERTIES COMPILE_FLAGS ${RESGEN_FLAGS})
  endif()
  +# WIN32 seems to require at least one C file, so create an empty one.
  +set(DUMMY_SRC "${RESOURCE_DIR}/dummy.c")
  +add_custom_command(OUTPUT ${DUMMY_SRC}
  + COMMAND echo "//" > ${DUMMY_SRC})
  +
  # ==================================================================================================
  # Include and target definitions
  # ==================================================================================================
  -add_library(${TARGET} STATIC ${RESGEN_SOURCE})
  +add_library(${TARGET} STATIC ${DUMMY_SRC} ${RESGEN_SOURCE})
  target_include_directories(${TARGET} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
  