Add CMake option to provide predownloaded nx_tzdb dir

Signed-off-by: Marcin Serwin <marcin@serwin.dev>

CMakeLists.txt

@@ -204,6 +204,8 @@ CMAKE_DEPENDENT_OPTION(YUZU_USE_FASTER_LD "Check if a faster linker is available
 
 CMAKE_DEPENDENT_OPTION(USE_SYSTEM_MOLTENVK "Use the system MoltenVK lib (instead of the bundled one)" OFF "APPLE" OFF)
 
+set(YUZU_TZDB_PATH "" CACHE STRING "Path to a pre-downloaded timezone database")
+
 set(DEFAULT_ENABLE_OPENSSL ON)
 if (ANDROID OR WIN32 OR APPLE OR PLATFORM_SUN)
     # - Windows defaults to the Schannel backend.

externals/nx_tzdb/CMakeLists.txt

@@ -33,9 +33,12 @@ if (CAN_BUILD_NX_TZDB AND NOT YUZU_DOWNLOAD_TIME_ZONE_DATA)
     set(NX_TZDB_TZ_DIR "${NX_TZDB_BASE_DIR}/zoneinfo")
 endif()
 
+if(NOT YUZU_TZDB_PATH STREQUAL "")
+    set(NX_TZDB_BASE_DIR "${YUZU_TZDB_PATH}")
+    set(NX_TZDB_TZ_DIR "${NX_TZDB_BASE_DIR}/zoneinfo")
+elseif (MSVC)
     # TODO(crueter): This is a terrible solution, but MSVC fails to link without it
     # Need to investigate further but I still can't reproduce...
-if (MSVC)
     set(NX_TZDB_VERSION "250725")
     set(NX_TZDB_ARCHIVE "${CPM_SOURCE_CACHE}/nx_tzdb/${NX_TZDB_VERSION}.zip")