Fix typos identified using codespell

See https://github.com/codespell-project/codespell#readme

The following command was used:

```
codespell -q6 --skip="\
.git,\
*.json,\
./Copyright.txt,\
./Help/command/foreach.rst,\
./Help/prop_test/REQUIRED_FILES.rst,\
./Help/variable/CTEST_COVERAGE_COMMAND.rst,\
./Modules/CMakeCheckCompilerFlagCommonPatterns.cmake,\
./Modules/CMakeRCInformation.cmake,\
./Modules/Internal/CPack/NSIS.template.in,\
./Modules/FindMatlab.cmake,\
./Modules/MatlabTestsRedirect.cmake,\
./Modules/Platform/Windows-Clang.cmake,\
./Modules/Platform/Windows-Intel-Fortran.cmake,\
./Modules/Platform/Windows-MSVC.cmake,\
./Source/CMakeVersion.cmake,\
./Source/cmConvertMSBuildXMLToJSON.py,\
./Source/cmCreateTestSourceList.cxx,\
./Source/cmGlobalVisualStudio10Generator.cxx,\
./Source/cmExportBuildFileGenerator.cxx,\
./Source/cmExportInstallAndroidMKGenerator.cxx,\
./Source/cmExportInstallFileGenerator.cxx,\
./Source/cmExportSet.cxx,\
./Source/cmExportTryCompileFileGenerator.cxx,\
./Source/cmFindPackageCommand.cxx,\
./Source/cmInstallCommand.cxx,\
./Source/cmGeneratorExpressionLexer.cxx,\
./Source/cmLocalVisualStudio7Generator.cxx,\
./Source/cmOrderDirectories.cxx,\
./Source/cmTarget.cxx,\
./Source/kwsys/*,\
./Source/QtDialog/CMakeSetupDialog.ui,\
./Source/CPack/WiX/cmWIXRichTextFormatWriter.cxx,\
./Source/CTest/cmParseCoberturaCoverage.h,\
./Tests/CMakeTests/ImplicitLinkInfoTest.cmake.in,\
./Tests/RunCMake/CPack/tests/DMG_SLA/English.license.rtf,\
./Tests/RunCMake/CPack/tests/DMG_SLA/German.license.txt,\
./Tests/RunCMake/CPack/tests/DMG_SLA/German.menu.txt,\
./Tests/RunCMake/GoogleTest/xml_output.cpp,\
./Tests/RunCMake/Make/TargetMessages*,\
./Utilities/*,\
" \
-L "\
dependees,\
endwhile,\
fo,\
filetest,\
helpfull,\
nd,\
objext,\
stoll,\
supercedes,\
superceded,\
vas,\
varn,\
"
```

3 files changed, 5 insertions, 5 deletions

diff --git a/Tests/RunCMake/foreach/foreach-ZIP_LISTS-multiple-iter-vars-test.cmake b/Tests/RunCMake/foreach/foreach-ZIP_LISTS-multiple-iter-vars-test.cmake
index 9647deabd1..3b03ed7a90 100644
--- a/Tests/RunCMake/foreach/foreach-ZIP_LISTS-multiple-iter-vars-test.cmake
+++ b/Tests/RunCMake/foreach/foreach-ZIP_LISTS-multiple-iter-vars-test.cmake
@@ -8,13 +8,13 @@ function(foreachTest result list_var_1 list_var_2 list_var_3)
     list(APPEND CMAKE_MESSAGE_INDENT "| ")
     foreach(first second third IN ZIP_LISTS ${list_var_1} ${list_var_2} ${list_var_3})
         if(NOT first)
-            set(first "[undefiend]")
+            set(first "[undefined]")
         endif()
         if(NOT second)
-            set(second "[undefiend]")
+            set(second "[undefined]")
         endif()
         if(NOT third)
-            set(third "[undefiend]")
+            set(third "[undefined]")
         endif()
         if(NOT _arg_MUTE)
             message(STATUS "${first}, ${second}, ${third}")
diff --git a/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test-stdout.txt b/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test-stdout.txt
index 25433fdc38..4730a86ed2 100644
--- a/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test-stdout.txt
+++ b/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test-stdout.txt
@@ -14,6 +14,6 @@
 --     | one, satu, raz
 --     | two, dua, dva
 --     | three, tiga, tri
---     | \[undefiend\], empat, \[undefiend\]
+--     | \[undefined\], empat, \[undefined\]
 --     End output
 --   <<< test variable value restored -- PASSED >>>
diff --git a/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test.cmake b/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test.cmake
index 56cfe64344..aa0ed0717f 100644
--- a/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test.cmake
+++ b/Tests/RunCMake/foreach/foreach-ZIP_LISTS-test.cmake
@@ -9,7 +9,7 @@ function(foreachTest result list_var_1 list_var_2 list_var_3)
     foreach(num IN ZIP_LISTS ${list_var_1} ${list_var_2} ${list_var_3})
         foreach(i RANGE 2)
             if(NOT num_${i})
-                set(num_${i} "[undefiend]")
+                set(num_${i} "[undefined]")
             endif()
         endforeach()
         if(NOT _arg_MUTE)