[msl-writer] Add struct offset support.

This CL adds support for injecting padding into structs in the MSL
backend.

Bug: tint:8
Change-Id: I83631a71ce4a2f00b61974ee2c0c7ca1b97f3028
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/24601
Reviewed-by: David Neto <dneto@google.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 088ca4f..4586ee4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -92,7 +92,7 @@
   else()
     message("Doxygen not found. Skipping documentation")
   endif(DOXYGEN_FOUND)
-endif(TINT_BUILD_DOCS)
+endif()
 
 if(MSVC)
   # We don't want to have to copy the C Runtime DLL everywhere the executable