Delete test which no longer applies

neg/projections required certain types of the form C#T to be ill-formed.
This is no longer done.

Author: odersky

test/dotc/tests.scala

@@ -104,7 +104,6 @@ class tests extends CompilerTest {
   @Test def neg_companions = compileFile(negDir, "companions", xerrors = 1)
   @Test def neg_over = compileFile(negDir, "over", xerrors = 3)
   @Test def neg_overrides = compileFile(negDir, "overrides", xerrors = 11)
-  @Test def neg_projections = compileFile(negDir, "projections", xerrors = 1)
   @Test def neg_i39 = compileFile(negDir, "i39", xerrors = 2)
   @Test def neg_i50_volatile = compileFile(negDir, "i50-volatile", xerrors = 6)
   @Test def neg_t0273_doubledefs = compileFile(negDir, "t0273", xerrors = 1)