externals: Add zlib and libzip libraries to handle ZIP file parsing

.gitmodules

@@ -46,3 +46,9 @@
 [submodule "sirit"]
     path = externals/sirit
     url = https://github.com/ReinUsesLisp/sirit
+[submodule "libzip"]
+	path = externals/libzip
+	url = https://github.com/DarkLordZach/libzip
+[submodule "zlib"]
+	path = externals/zlib
+	url = https://github.com/DarkLordZach/zlib

externals/CMakeLists.txt

@@ -77,6 +77,12 @@ if (ENABLE_VULKAN)
     add_subdirectory(sirit)
 endif()
 
+# libzip
+add_subdirectory(libzip)
+
+# zlib
+add_subdirectory(zlib)
+
 if (ENABLE_WEB_SERVICE)
     # LibreSSL
     set(LIBRESSL_SKIP_INSTALL ON CACHE BOOL "")

externals/libzip

@@ -0,0 +1 @@
+Subproject commit bebbb54c8e691f019415fcb852ef4d53ebbc5000

externals/zlib

@@ -0,0 +1 @@
+Subproject commit 094ed57db392170130bc710293568de7b576306d