Subzero: Enable a cmake build.

This just puts the CMakeLists.txt file in place.  A couple other
changes are needed in other repos to make this take effect.

BUG= none
R=dschuff@chromium.org, mtrofin@chromium.org

Review URL: https://codereview.chromium.org/998693003
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..8db25d8
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,21 @@
+set(LLVM_LINK_COMPONENTS
+  ${LLVM_TARGETS_TO_BUILD}
+  Core
+  IRReader
+  NaClBitReader
+  Support
+  )
+
+file(GLOB pnacl_sz_SRCS "src/*.cpp")
+add_llvm_tool(pnacl-sz ${pnacl_sz_SRCS})
+
+add_definitions(
+  -DALLOW_DUMP=1
+  -DALLOW_LLVM_CL=1
+  -DALLOW_LLVM_IR=1
+  -DALLOW_LLVM_IR_AS_INPUT=1
+  -DALLOW_DISABLE_IR_GEN=1
+  -DALLOW_MINIMAL_BUILD=0
+  )
+
+target_link_libraries(pnacl-sz pthread)