Fix incorrect Lua source files in the Lua library build

Fix incorrect Lua source files in the Lua library build. The
sources include lua.c and luac.c which contain actual programs
with "int main" entry points.

third_party/CMakeLists.txt

@@ -68,8 +68,6 @@ add_library(Lua
         lua/src/ltable.c
         lua/src/ltablib.c
         lua/src/ltm.c
-        lua/src/lua.c
-        lua/src/luac.c
         lua/src/lundump.c
         lua/src/lutf8lib.c
         lua/src/lvm.c