Fix misc. typos

Found via `codespell -q 3 -I ../cmake-whitelist.txt --skip="./Utilities"`
where the whitelist consists of

```
aci
ans
behaviour
buil
convertor
dum
earch
ect
emmited
emmitted
helpfull
iff
isnt
ith
lowercased
mose
nd
nknown
nto
objext
ot
pathes
pevents
splitted
substract
superceded
supercedes
te
tim
todays
uint
upto
whitespaces
```

3 files changed, 4 insertions, 4 deletions

diff --git a/Source/CTest/cmCTestScriptHandler.cxx b/Source/CTest/cmCTestScriptHandler.cxx
index 6b62bb4..a87473d 100644
--- a/Source/CTest/cmCTestScriptHandler.cxx
+++ b/Source/CTest/cmCTestScriptHandler.cxx
@@ -563,7 +563,7 @@ int cmCTestScriptHandler::RunCurrentScript()
 
   // now that we have done most of the error checking finally run the
   // dashboard, we may be asked to repeatedly run this dashboard, such as
-  // for a continuous, do we ned to run it more than once?
+  // for a continuous, do we need to run it more than once?
   if (this->ContinuousDuration >= 0) {
     this->UpdateElapsedTime();
     auto ending_time =
diff --git a/Source/CTest/cmParseGTMCoverage.cxx b/Source/CTest/cmParseGTMCoverage.cxx
index 822363d..83dde3f 100644
--- a/Source/CTest/cmParseGTMCoverage.cxx
+++ b/Source/CTest/cmParseGTMCoverage.cxx
@@ -160,7 +160,7 @@ bool cmParseGTMCoverage::ParseMCOVLine(std::string const& line,
 {
   // this method parses lines from the .mcov file
   // each line has ^COVERAGE(...) in it, and there
-  // are several varients of coverage lines:
+  // are several variants of coverage lines:
   //
   // ^COVERAGE("DIC11","PR1",0)="2:0:0:0"
   //          ( file  , entry, line ) = "number_executed:timing_info"
diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 8339aac..d05d660 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -2826,11 +2826,11 @@ bool cmSystemTools::RemoveRPath(std::string const& file, std::string* emsg,
         // contain the location of the linker map, however on MIPS the
         // .dynamic section is always read-only so this is not possible. MIPS
         // objects instead contain a DT_MIPS_RLD_MAP tag which contains the
-        // address where the dyanmic linker will write to (an indirect
+        // address where the dynamic linker will write to (an indirect
         // version of DT_DEBUG). Since this doesn't work when using PIE, a
         // relative equivalent was created - DT_MIPS_RLD_MAP_REL. Since this
         // version contains a relative offset, moving it changes the
-        // calculated address. This may cause the dyanmic linker to write
+        // calculated address. This may cause the dynamic linker to write
         // into memory it should not be changing.
         //
         // To fix this, we adjust the value of DT_MIPS_RLD_MAP_REL here. If