Use CPack for Windows packaging

cmake/deps.cmake

@@ -5,6 +5,7 @@
 FetchContent_Declare(PNG
                      URL https://download.sourceforge.net/libpng/libpng-1.6.56.tar.xz
                      URL_HASH SHA256=f7d8bf1601b7804f583a254ab343a6549ca6cf27d255c302c47af2d9d36a6f18
+                     EXCLUDE_FROM_ALL # We only install the runtime dependencies, and do so separately.
                      FIND_PACKAGE_ARGS 1.5.4)
 
 set(PNG_TESTS OFF CACHE INTERNAL "") # We do not care for these two (and they can even cause compile errors!)
@@ -15,6 +16,7 @@ set(PNG_STATIC OFF CACHE INTERNAL "")
 FetchContent_Declare(ZLIB
                      URL https://www.zlib.net/zlib-1.3.2.tar.xz
                      URL_HASH SHA256=d7a0654783a4da529d1bb793b7ad9c3318020af77667bcae35f95d0e42a792f3
+                     EXCLUDE_FROM_ALL # We only install the runtime dependencies, and do so separately.
 # libpng documents requiring "zlib 1.0.4 or later (1.2.13 or later recommended for performance and security reasons)".
 # We thus enforce 1.0.4, but note that the libpng source code mentions that "it may work with versions as old as zlib 0.95".
                      FIND_PACKAGE_ARGS 1.0.4)