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/cmNinjaTargetGenerator.cxx b/Source/cmNinjaTargetGenerator.cxx
index 4d58242..4a252f3 100644
--- a/Source/cmNinjaTargetGenerator.cxx
+++ b/Source/cmNinjaTargetGenerator.cxx
@@ -134,7 +134,7 @@ void cmNinjaTargetGenerator::AddIncludeFlags(std::string& languageFlags,
     // needed by cmcldeps
     false, this->GetConfigName());
   if (this->GetGlobalGenerator()->IsGCCOnWindows())
-    cmSystemTools::ReplaceString(includeFlags, "\\", "/");
+    std::replace(includeFlags.begin(), includeFlags.end(), '\\', '/');
 
   this->LocalGenerator->AppendFlags(languageFlags, includeFlags);
 }