cmGeneratedFileStream: clang-tidy applied to remove redundant ``c_str`` calls

After changing the ``cmGeneratedFileStream`` methods to accept
``std::string const&`` instead of ``const char*`` we don't
need to call ``std::string::c_str`` anymore when passing
a ``std::string`` to a ``cmGeneratedFileStream`` method.

This patch removes all redundant ``std::string::c_str``
calls when passing a string to a ``cmGeneratedFileStream`` method.

It was generated by building CMake with clang-tidy enabled using
the following options:

-DCMAKE_CXX_CLANG_TIDY=/usr/bin/clang-tidy-4.0;-checks=-*,readability-redundant-string-cstr;-fix;-fix-errors

1 files changed, 2 insertions, 2 deletions

diff --git a/Source/CTest/cmCTestBuildHandler.cxx b/Source/CTest/cmCTestBuildHandler.cxx
index 8527d54..65844bd 100644
--- a/Source/CTest/cmCTestBuildHandler.cxx
+++ b/Source/CTest/cmCTestBuildHandler.cxx
@@ -742,7 +742,7 @@ void cmCTestBuildHandler::LaunchHelper::WriteLauncherConfig()
   // Give some testing configuration information to the launcher.
   std::string fname = this->Handler->CTestLaunchDir;
   fname += "/CTestLaunchConfig.cmake";
-  cmGeneratedFileStream fout(fname.c_str());
+  cmGeneratedFileStream fout(fname);
   std::string srcdir = this->CTest->GetCTestConfiguration("SourceDirectory");
   fout << "set(CTEST_SOURCE_DIRECTORY \"" << srcdir << "\")\n";
 }
@@ -757,7 +757,7 @@ void cmCTestBuildHandler::LaunchHelper::WriteScrapeMatchers(
   fname += "/Custom";
   fname += purpose;
   fname += ".txt";
-  cmGeneratedFileStream fout(fname.c_str());
+  cmGeneratedFileStream fout(fname);
   for (std::string const& m : matchers) {
     fout << m << "\n";
   }