Auto merge of rust-lang#36034 - ahmedcharles:orbit, r=eddyb

Remove --{enable|disable}-orbit from configure.

Fixes rust-lang#35956.

r? @eddyb

There are only two buildbots left, though they are both failing. Is there something to be done there other than wait?

configure

@@ -613,7 +613,6 @@ opt dist-host-only 0 "only install bins for the host architecture"
 opt inject-std-version 1 "inject the current compiler version of libstd into programs"
 opt llvm-version-check 1 "check if the LLVM version is supported, build anyway"
 opt rustbuild 0 "use the rust and cargo based build system"
-opt orbit 1 "get MIR where it belongs - everywhere; most importantly, in orbit"
 opt codegen-tests 1 "run the src/test/codegen tests"
 opt option-checking 1 "complain about unrecognized options in this configure script"
 opt ninja 0 "build LLVM using the Ninja generator (for MSVC, requires building in the correct environment)"