Build more debugger/selectiondag libraries as archives instead of .o files.
This works around bugs in some versions of the cygwin linker.

Patch contributed by Anton Korobeynikov.

llvm-svn: 29239
diff --git a/llvm/lib/Debugger/Makefile b/llvm/lib/Debugger/Makefile
index 70ee46e..c322064 100644
--- a/llvm/lib/Debugger/Makefile
+++ b/llvm/lib/Debugger/Makefile
@@ -11,5 +11,6 @@
 LIBRARYNAME = LLVMDebugger
 EXTRA_DIST = README.txt
 REQUIRES_EH := 1
+BUILD_ARCHIVE = 1
 
 include $(LEVEL)/Makefile.common