Disable GCC warning in nvcc generated code

Fixes the following warning:
```
/builds/hzdr/crp/alpaka/test/unit/math/src/Defines.hpp:52:35: error: left operand of comma operator has no effect [-Werror=unused-value]
   52 |                         for(size_t i = 0; i < argsItem.arity_nr; ++i)
      |                          ~~~~~~~~~^~~~~~~~~~
```

test/common/devCompileOptions.cmake

@@ -123,6 +123,7 @@ if(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
     list(APPEND alpaka_DEV_COMPILE_OPTIONS "-Walloc-zero")
     list(APPEND alpaka_DEV_COMPILE_OPTIONS "-Walloca")
     list(APPEND alpaka_DEV_COMPILE_OPTIONS "-Wcast-align=strict")
+    list(APPEND alpaka_DEV_COMPILE_OPTIONS "$<$<COMPILE_LANGUAGE:CUDA>:SHELL:-Xcompiler -Wno-unused-value>") # occurs in nvcc-generated code
 endif()
 
 # Clang, AppleClang, ICPX