Add the accidentally removed -Wall

Signed-off-by: Greg Bonik <gbonik@nvidia.com>

Author: gbonik

CMakeLists.txt

@@ -20,7 +20,7 @@ if (NOT ALLOW_WARNINGS)
     if (MSVC)
         add_compile_options(/WX)
     else()
-        add_compile_options(-Werror)
+        add_compile_options(-Wall -Werror)
     endif()
 else()
     if (MSVC)