Add the Celestia recipe

recipes/wip/science/celestia/recipe.toml

+#TODO probably wrong script, see https://github.com/CelestiaProject/Celestia/blob/master/INSTALL.md#celestia-install-instructions-for-unix
+#TODO finish the recipes of some dependencies
+#TODO the SDL2 frontend is limited, Qt6 or Qt5 is preferred
+[source]
+tar = "https://github.com/CelestiaProject/Celestia/releases/download/1.6.4/celestia-1.6.4.tar.xz"
+[build]
+template = "custom"
+dependencies = [
+    "mesa",
+    "mesa-glu",
+    "sdl2",
+    "libepoxy",
+    "libeigen",
+    "libfmt",
+    "freetype2",
+    "libpng",
+    "libjpeg",
+    "luajit",
+]
+script = """
+COOKBOOK_CONFIGURE="cmake"
+COOKBOOK_CONFIGURE_FLAGS=(
+    -DCMAKE_BUILD_TYPE=Release
+    -DCMAKE_CROSSCOMPILING=True
+    -DCMAKE_EXE_LINKER_FLAGS="-static"
+    -DCMAKE_INSTALL_PREFIX="/"
+    -DCMAKE_PREFIX_PATH="${COOKBOOK_SYSROOT}"
+    -DCMAKE_SYSTEM_NAME=Generic
+    -DCMAKE_SYSTEM_PROCESSOR="$(echo "${TARGET}" | cut -d - -f1)"
+    -DCMAKE_VERBOSE_MAKEFILE=On
+    -DENABLE_INTERFACE=ON
+"${COOKBOOK_SOURCE}"
+)
+cookbook_configure
+"""