pkg download command and patches

assets/var/gnu/slint.md

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+slint 1.17.1
+=
+https://github.com/slint-ui/slint/archive/refs/tags/v1.17.1.tar.gz
+
+``` env *** env ***
+CARGO_PROFILE_RELEASE_LTO=fat
+CARGO_PROFILE_RELEASE_CODEGEN_UNITS=1
+CARGO_PROFILE_RELEASE_STRIP=symbols
+CARGO_PROFILE_RELEASE_OPT_LEVEL=z
+CARGO_PROFILE_RELEASE_PANIC=abort
+CARGO_PROFILE_RELEASE_DEBUG=false
+CARGO_INCREMENTAL=false
+CARGO_NET_OFFLINE=true
+```
+
+``` sh *** patch ***
+cat <<EOF >> /pkg/gnu/slint/src/.cargo/config.toml
+
+[profile.release]
+lto = "fat"
+codegen-units = 1
+strip = "symbols"
+opt-level = "z"
+panic = "abort"
+debug = false
+
+# Remove absolute paths from the binary
+[build]
+rustflags = ["--remap-path-prefix=/pkg/gnu/rustup/registry/src=/src", "--remap-path-prefix=/rustc=/rustc", "-Cpanic=abort"]
+EOF
+```
+
+
+``` sh *** build ***
+mkdir -p build; cd build
+cmake -DCMAKE_INSTALL_PREFIX="$pkgpath" \
+      -DCMAKE_BUILD_TYPE=MinSizeRel \
+      -DBUILD_SHARED_LIBS=OFF \
+      -DBUILD_TESTING=OFF \
+      -DSLINT_FEATURE_RENDERER_FEMTOVG=OFF \
+      -DSLINT_FEATURE_RENDERER_SOFTWARE=ON \
+      -DSLINT_FEATURE_INTERPRETER=OFF \
+      -DSLINT_FEATURE_ACCESSIBILITY=OFF \
+      -DSLINT_FEATURE_TESTING=OFF \
+      -DSLINT_FEATURE_BACKEND_WINIT_X11=OFF \
+      -DSLINT_FEATURE_BACKEND_WINIT_WAYLAND=ON \
+      -G Ninja ..
+cmake --build . 
+cmake --install .
+```