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, 1 insertions, 1 deletions

diff --git a/Source/cmNinjaNormalTargetGenerator.cxx b/Source/cmNinjaNormalTargetGenerator.cxx
index f94e5bc..b634b0a 100644
--- a/Source/cmNinjaNormalTargetGenerator.cxx
+++ b/Source/cmNinjaNormalTargetGenerator.cxx
@@ -956,7 +956,7 @@ void cmNinjaNormalTargetGenerator::WriteLinkStatement()
     preLinkCmdLines.push_back(std::move(cmd));
 
     // create a list of obj files for the -E __create_def to read
-    cmGeneratedFileStream fout(obj_list_file.c_str());
+    cmGeneratedFileStream fout(obj_list_file);
 
     if (mdi->WindowsExportAllSymbols) {
       cmNinjaDeps objs = this->GetObjects();