Use std::replace for replacing chars in strings.

Find uses of `cmSystemTools::ReplaceString` where both `replace` and
`with` are string literals with a size of one.

Automate with:

git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\(.\)\", \"\(.\)\");|std::replace(\1.begin(), \1.end(), '\2', '\3');|g"
git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\(.\)\", \"\\\\\\\\\");|std::replace(\1.begin(), \1.end(), '\2', '\\\\\\\\');|g"
git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\\\\\\\\\", \"\(.\)\");|std::replace(\1.begin(), \1.end(), '\\\\\\\\', '\2');|g"

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/cmSeparateArgumentsCommand.cxx b/Source/cmSeparateArgumentsCommand.cxx
index 3438321..440b635 100644
--- a/Source/cmSeparateArgumentsCommand.cxx
+++ b/Source/cmSeparateArgumentsCommand.cxx
@@ -62,7 +62,7 @@ bool cmSeparateArgumentsCommand::InitialPass(
     // Original space-replacement version of command.
     if (const char* def = this->Makefile->GetDefinition(var)) {
       std::string value = def;
-      cmSystemTools::ReplaceString(value, " ", ";");
+      std::replace(value.begin(), value.end(), ' ', ';');
       this->Makefile->AddDefinition(var, value.c_str());
     }
   } else {