Make Ulf Norell's `define` example work in all backends

[andreasabel]

The original example for define by Ulf Norell is currently only accepted by the Haskell backends.

bnfc/examples/DefinedRules.cf

Lines 22 to 23 in 3da1b0e

	define if e s = If e s (Block []) ;
	define for i c s b = Block [i, While c (Block [b, s])] ;

• Agda: wrong list constructors
• C: list constructors rendered wrongly as make_(:) and make_[].
• CPP: missing sanitization of if and for (keyword clash, regression), wrong list constructors.
• Ocaml: missing sanitization (regression), list cons (:) (a,b) instead of (a :: b).
• Java: missing sanitization (regression), complaint that if clashes with If. Works in 2.9.1 with --force.

Missing sanitization is a regression wrt. 2.9.1, introduced by #287.
The list constructors probably never worked.

[shlevy]

@andreasabel We just hit:

C: list constructors rendered wrongly as make_(:) and make_[]

Any pointers to fix?