add sccache (#855)

* add sccache

* reverse conf flag

* Add cargo_license and cargo_license_summary macros

* remove license macros because meh

* Update rust-sccache.spec to disable shebang mangling

This commit updates the rust-sccache.spec file to disable shebang mangling. This change ensures that shebangs are not modified during the build process.

* Fix shebangs in rust-sccache.spec

* Add conditional compilation for dist server

* Fix package dependencies

* Add sccache-dist binary if dist_server is enabled

anda/apps/sccache/anda.hcl

@@ -0,0 +1,5 @@
+project pkg {
+	rpm {
+		spec = "rust-sccache.spec"
+	}
+}