FindCUDA: Avoid if() auto-dereference in string comparisons

This silences possible CMP0054 warnings.

Modules/FindCUDA.cmake

@@ -894,15 +894,15 @@ macro(CUDA_GET_SOURCES_AND_OPTIONS _sources _cmake_options _options)
   set( ${_options} )
   set( _found_options FALSE )
   foreach(arg ${ARGN})
-    if(arg STREQUAL "OPTIONS")
+    if("x${arg}" STREQUAL "xOPTIONS")
       set( _found_options TRUE )
     elseif(
-        arg STREQUAL "WIN32" OR
-        arg STREQUAL "MACOSX_BUNDLE" OR
-        arg STREQUAL "EXCLUDE_FROM_ALL" OR
-        arg STREQUAL "STATIC" OR
-        arg STREQUAL "SHARED" OR
-        arg STREQUAL "MODULE"
+        "x${arg}" STREQUAL "xWIN32" OR
+        "x${arg}" STREQUAL "xMACOSX_BUNDLE" OR
+        "x${arg}" STREQUAL "xEXCLUDE_FROM_ALL" OR
+        "x${arg}" STREQUAL "xSTATIC" OR
+        "x${arg}" STREQUAL "xSHARED" OR
+        "x${arg}" STREQUAL "xMODULE"
         )
       list(APPEND ${_cmake_options} ${arg})
     else()

Modules/FindCUDA/run_nvcc.cmake

@@ -126,7 +126,7 @@ endif()
 # and other return variables are present after executing the process.
 macro(cuda_execute_process status command)
   set(_command ${command})
-  if(NOT _command STREQUAL "COMMAND")
+  if(NOT "x${_command}" STREQUAL "xCOMMAND")
     message(FATAL_ERROR "Malformed call to cuda_execute_process.  Missing COMMAND as second argument. (command = ${command})")
   endif()
   if(verbose)