Filter out dragonegg when checked out into a projects subdirectory.

There is some hope of eventually supporting a unified build with it, but
until then this lets me (and others) check it out in this location
without things breaking.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184697 91177308-0d34-0410-b5e6-96231b3b80d8

projects/Makefile

@@ -20,6 +20,9 @@ DIRS := $(filter-out compiler-rt,$(DIRS))
 # Don't build libcxx, it isn't designed to be built directly.
 DIRS := $(filter-out libcxx,$(DIRS))
 
+# DragonEgg may be checked out here but doesn't (yet) build directly.
+DIRS := $(filter-out dragonegg,$(DIRS))
+
 # Sparc cannot link shared libraries (libtool problem?)
 ifeq ($(ARCH), Sparc)
 DIRS := $(filter-out sample, $(DIRS))