[ci] fix macos build error, add missing new unit in cmake

Author: fangq

src/CMakeLists.txt

@@ -67,6 +67,8 @@ cuda_add_library(mcx STATIC
     mcx_shapes.h
     mcx_bench.c
     mcx_bench.h
+    mcx_lang.c
+    mcx_lang.h
     mcx_mie.cpp
     mcx_mie.h
     mcx_tictoc.c
@@ -105,6 +107,8 @@ if (BUILD_PYTHON)
             mcx_shapes.h
             mcx_bench.c
             mcx_bench.h
+            mcx_lang.c
+            mcx_lang.h
             mcx_mie.cpp
             mcx_mie.h
             mcx_tictoc.c
@@ -136,6 +140,8 @@ if(BUILD_MEX AND Matlab_FOUND)
             mcx_shapes.h
             mcx_bench.c
             mcx_bench.h
+            mcx_lang.c
+            mcx_lang.h
             mcx_mie.cpp
             mcx_mie.h
             mcx_tictoc.c