BinUtils: Use more-private temporary variable names

Since commit 4d786dfc (BinUtils: Avoid clobbering a variable named
without a private prefix, 2021-04-06, v3.20.1~4^2) we use variables
named `_tool` and `_name`, but these may still be common enough to
affect project code.  Use `_CMAKE_TOOL` and `_CMAKE_TOOL_NAME` instead,
and unset them when finished.

Fixes: #22140

Modules/CMakeFindBinUtils.cmake

@@ -123,19 +123,19 @@ else()
     list(APPEND _CMAKE_TOOL_VARS AR RANLIB STRIP LINKER NM OBJDUMP OBJCOPY READELF DLLTOOL ADDR2LINE)
 endif()
 
-foreach(_tool IN LISTS _CMAKE_TOOL_VARS)
-  foreach(_name IN LISTS _CMAKE_${_tool}_NAMES)
+foreach(_CMAKE_TOOL IN LISTS _CMAKE_TOOL_VARS)
+  foreach(_CMAKE_TOOL_NAME IN LISTS _CMAKE_${_CMAKE_TOOL}_NAMES)
     if(NOT _CMAKE_TOOLCHAIN_PREFIX STREQUAL "")
       if(NOT _CMAKE_TOOLCHAIN_SUFFIX STREQUAL "")
-        list(PREPEND _CMAKE_${_tool}_NAMES ${_name}${_CMAKE_TOOLCHAIN_SUFFIX})
+        list(PREPEND _CMAKE_${_CMAKE_TOOL}_NAMES ${_CMAKE_TOOL_NAME}${_CMAKE_TOOLCHAIN_SUFFIX})
       endif()
-      list(PREPEND _CMAKE_${_tool}_NAMES ${_CMAKE_TOOLCHAIN_PREFIX}${_name})
+      list(PREPEND _CMAKE_${_CMAKE_TOOL}_NAMES ${_CMAKE_TOOLCHAIN_PREFIX}${_CMAKE_TOOL_NAME})
     endif()
     if(NOT _CMAKE_TOOLCHAIN_SUFFIX STREQUAL "")
-      list(PREPEND _CMAKE_${_tool}_NAMES ${_CMAKE_TOOLCHAIN_PREFIX}${_name}${_CMAKE_TOOLCHAIN_SUFFIX})
+      list(PREPEND _CMAKE_${_CMAKE_TOOL}_NAMES ${_CMAKE_TOOLCHAIN_PREFIX}${_CMAKE_TOOL_NAME}${_CMAKE_TOOLCHAIN_SUFFIX})
     endif()
   endforeach()
-  find_program(CMAKE_${_tool} NAMES ${_CMAKE_${_tool}_NAMES} HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
+  find_program(CMAKE_${_CMAKE_TOOL} NAMES ${_CMAKE_${_CMAKE_TOOL}_NAMES} HINTS ${_CMAKE_TOOLCHAIN_LOCATION})
 endforeach()
 
 if(NOT CMAKE_RANLIB)
@@ -154,12 +154,14 @@ if(CMAKE_PLATFORM_HAS_INSTALLNAME)
 endif()
 
 # Mark any tool cache entries as advanced.
-foreach(_tool IN LISTS _CMAKE_TOOL_VARS)
-  get_property(_CMAKE_TOOL_CACHED CACHE CMAKE_${_tool} PROPERTY TYPE)
+foreach(_CMAKE_TOOL IN LISTS _CMAKE_TOOL_VARS)
+  get_property(_CMAKE_TOOL_CACHED CACHE CMAKE_${_CMAKE_TOOL} PROPERTY TYPE)
   if(_CMAKE_TOOL_CACHED)
-    mark_as_advanced(CMAKE_${_tool})
+    mark_as_advanced(CMAKE_${_CMAKE_TOOL})
   endif()
-  unset(_CMAKE_${_tool}_NAMES)
+  unset(_CMAKE_${_CMAKE_TOOL}_NAMES)
 endforeach()
 unset(_CMAKE_TOOL_VARS)
 unset(_CMAKE_TOOL_CACHED)
+unset(_CMAKE_TOOL_NAME)
+unset(_CMAKE_TOOL)