codespell: Split multi-valued configuration across multiple lines

The `codespell` implementation cleans up newlines and whitespace
before splitting comma-separated lists.

Also drop an unused entry.

.codespellrc

@@ -4,5 +4,54 @@ check-hidden =
 # Disable warnings about binary files
 quiet-level = 2
 builtin = clear,rare,en-GB_to_en-US
-skip = */.git,*/build,*/Copyright.txt,*/CTestCustom.cmake.in,*/doxygen.config,*/Modules/Internal/CPack/NSIS.template.in,*/Source/CursesDialog/form/*,*/Source/kwsys/*,*/Tests/RunCMake/CPack/tests/DMG_SLA/German.*,*/Tests/RunCMake/ParseImplicitData/*.input,*/Tests/StringFileTest/test.utf8,*.pfx,*/Utilities/cm*
-ignore-words-list = aci,ags,ake,ans,ba,ccompiler,cconfiguration,certi,conly,copyin,dependees,dne,dum,earch,ect,filetest,fo,helpfull,hiden,isnt,keypair,nd,ned,nin,nknown,ot,pard,sectionin,seh,ser,te,upto,varn,vas,wee
+
+skip =
+  */.git,
+  */build,
+  */Copyright.txt,
+  */CTestCustom.cmake.in,
+  */Modules/Internal/CPack/NSIS.template.in,
+  */Source/CursesDialog/form/*,
+  */Source/kwsys/*,
+  */Tests/RunCMake/CPack/tests/DMG_SLA/German.*,
+  */Tests/RunCMake/ParseImplicitData/*.input,
+  */Tests/StringFileTest/test.utf8,
+  */Utilities/cm*,
+  *.pfx,
+
+ignore-words-list =
+  aci,
+  ags,
+  ake,
+  ans,
+  ba,
+  ccompiler,
+  cconfiguration,
+  certi,
+  conly,
+  copyin,
+  dependees,
+  dne,
+  dum,
+  earch,
+  ect,
+  filetest,
+  fo,
+  helpfull,
+  hiden,
+  isnt,
+  keypair,
+  nd,
+  ned,
+  nin,
+  nknown,
+  ot,
+  pard,
+  sectionin,
+  seh,
+  ser,
+  te,
+  upto,
+  varn,
+  vas,
+  wee,