Disable freetype for iOS/tvOS builds

The CI runners have Homebrew freetype installed for macOS, but
find_package picks it up during iOS/tvOS cross-compilation due
to permissive CMAKE_FIND_ROOT_PATH_MODE settings. Freetype is
not available in the iOS/tvOS SDKs, so disable it.

Author: encounter

CMakePresets.json

@@ -248,6 +248,10 @@
           "value": false
         },
         "Rust_CARGO_TARGET": "aarch64-apple-ios",
+        "IMGUI_USE_FREETYPE": {
+          "type": "BOOL",
+          "value": false
+        },
         "CMAKE_DISABLE_FIND_PACKAGE_BZip2": {
           "type": "BOOL",
           "value": true
@@ -285,6 +289,10 @@
         },
         "Rust_CARGO_TARGET": "aarch64-apple-tvos",
         "Rust_TOOLCHAIN": "nightly",
+        "IMGUI_USE_FREETYPE": {
+          "type": "BOOL",
+          "value": false
+        },
         "Rust_RUSTUP_INSTALL_MISSING_TARGET": {
           "type": "BOOL",
           "value": true