raco setup / raco pkg install: add --fail-fast flag

This flag is useful for speculative package installations runs where
we'd like to give up and try something else if it's not working.
Specifically, we might try installing multiple packages at once,
and then back off to a smaller subset if something goes wrong.

original commit: d316652160

pkgs/compiler-pkgs/compiler-lib/info.rkt

@@ -10,4 +10,4 @@
 
 (define pkg-authors '(mflatt))
 
-(define version "1.1")
+(define version "1.2")