`undefined parse transform' parse transforms which call non-existing modules

Hi,

I noticed that a warning has been added to the compiler which says
`undefined parse transform' instead of throwing a (potentially large) parse
tree in the face of the user.  Nice!  This is the commit:

dba5396 compile: Give a friendler error message if a parse transform cannot
be found

I discovered that is has an unfortunate side-effect:

If an existing parse transform calls a non-existing module, the check will
misinterpret this and print the `undefined parse transform' error.

Tested with compiler-5.0.3 on Erlang/OTP 17.4.

Example parse transform:

-module(x).

-compile(export_all).

parse_transform(_Forms, _Opts) ->
    non:existing().



Cheers,
Klas

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