delete bogus FIXME

in the context of possibly using the same parse result for multiple
build configurations, resolving env variables already during parsing
would be just wrong.

Change-Id: I49367b5eff5868a38c026b8bd74148e0b359fffb
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/shared/proparser/qmakeparser.cpp

@@ -459,7 +459,6 @@ bool QMakeParser::read(ProFile *pro, const QString &in)
                             term = '}';
                             c = *++cur;
                         } else if (c == '(') {
-                            // FIXME: could/should expand this immediately
                             ptr += 2;
                             tok = TokEnvVar;
                             term = ')';