testing/ghc-filesystem: new aport

An implementation of C++17 std::filesystem for C++11 /C++14/C++17/C++20
https://github.com/gulrak/filesystem

testing/ghc-filesystem/APKBUILD

+# Contributor: Holger Jaekel <holger.jaekel@gmx.de>
+# Maintainer: Holger Jaekel <holger.jaekel@gmx.de>
+pkgname=ghc-filesystem
+pkgver=1.5.14
+pkgrel=0
+pkgdesc="An implementation of C++17 std::filesystem for C++11 /C++14/C++17/C++20"
+url="https://github.com/gulrak/filesystem"
+arch="noarch"
+license="MIT"
+makedepends="cmake samurai"
+checkdepends="catch2"
+source="filesystem-$pkgver.tar.gz::https://github.com/gulrak/filesystem/archive/refs/tags/v$pkgver.tar.gz"
+builddir=$srcdir/filesystem-$pkgver
+
+build() {
+	if [ "$CBUILD" != "$CHOST" ]; then
+		local crossopts="-DCMAKE_SYSTEM_NAME=Linux -DCMAKE_HOST_SYSTEM_NAME=Linux"
+	fi
+	cmake -B build -G Ninja \
+		-DCMAKE_INSTALL_PREFIX=/usr \
+		-DCMAKE_INSTALL_LIBDIR=lib \
+		-DBUILD_SHARED_LIBS=ON \
+		-DCMAKE_BUILD_TYPE=None \
+		$crossopts
+	cmake --build build
+}
+
+check() {
+	ctest --test-dir build --output-on-failure
+}
+
+package() {
+	DESTDIR="$pkgdir" cmake --install build
+}
+
+sha512sums="
+6eae921485ecdaf4b8329a568b1f4f612ee491fc5fdeafce9c8000b9bf1a73b6fa4e07d0d4ddf05be49efe79e9bddfbcc0aba85529cb016668797a8d89eb9b82  filesystem-1.5.14.tar.gz
+"