emulators/yuzu: unbreak after r560536

• libzip 1.5 or newer not found, falling back to externals

CMake Error at externals/libzip/CMakeLists.txt:34 (INCLUDE):

INCLUDE could not find load file:

  FindNettle

CMake Error: File externals/libzip/libzip/cmake-config.h.in does not exist.
CMake Error at externals/libzip/CMakeLists.txt:358 (CONFIGURE_FILE):

CONFIGURE_FILE Problem configuring file

CMake Error: File externals/libzip/libzip/cmake-zipconf.h.in does not exist.
CMake Error at externals/libzip/CMakeLists.txt:359 (CONFIGURE_FILE):

CONFIGURE_FILE Problem configuring file