LLVMC can be now compiled w/o dynamic plugin support.

Controlled via the --enable-llvmc-dynamic-plugins option.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74784 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CompilerDriver/Makefile b/lib/CompilerDriver/Makefile
index 6084e88..a5ecfd5 100644
--- a/lib/CompilerDriver/Makefile
+++ b/lib/CompilerDriver/Makefile
@@ -25,6 +25,10 @@
 
 include $(LEVEL)/Makefile.common
 
+ifeq ($(ENABLE_LLVMC_DYNAMIC_PLUGINS), 1)
+    CPP.Flags += -DENABLE_LLVMC_DYNAMIC_PLUGINS
+endif
+
 # Copy libCompilerDriver to the bin dir so that llvmc can find it.
 ifeq ($(ENABLE_LLVMC_DYNAMIC),1)