[libcxx] [test] Use string().c_str() to convert a std::filesystem::path to a const char*

On Windows, path::value_type is wchar_t, so one can't pass the return
value of path::c_str() directly to std::remove().

This matches what was done for tests under std/input.output/filesystems
in 81db3c31aa and
3784bdf217.

Differential Revision: https://reviews.llvm.org/D97458

libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/open_path.pass.cpp

@@ -46,7 +46,7 @@ int main(int, char**) {
     assert(f.sbumpc() == '2');
     assert(f.sbumpc() == '3');
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
   {
     std::wfilebuf f;
     assert(f.open(p, std::ios_base::out) != 0);
@@ -61,7 +61,7 @@ int main(int, char**) {
     assert(f.sbumpc() == L'2');
     assert(f.sbumpc() == L'3');
   }
-  remove(p.c_str());
+  remove(p.string().c_str());
 
   return 0;
 }

libcxx/test/std/input.output/file.streams/fstreams/fstream.cons/path.pass.cpp

@@ -44,7 +44,7 @@ int main(int, char**) {
     fs >> x;
     assert(x == 3.25);
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
   {
     std::wfstream fs(p, std::ios_base::in | std::ios_base::out |
                             std::ios_base::trunc);
@@ -54,7 +54,7 @@ int main(int, char**) {
     fs >> x;
     assert(x == 3.25);
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
 
   return 0;
 }

libcxx/test/std/input.output/file.streams/fstreams/fstream.members/open_path.pass.cpp

@@ -44,7 +44,7 @@ int main(int, char**) {
     stream >> x;
     assert(x == 3.25);
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
   {
     std::wfstream stream;
     assert(!stream.is_open());
@@ -57,7 +57,7 @@ int main(int, char**) {
     stream >> x;
     assert(x == 3.25);
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
 
   return 0;
 }

libcxx/test/std/input.output/file.streams/fstreams/ofstream.cons/path.pass.cpp

@@ -57,7 +57,7 @@ int main(int, char**) {
     stream >> x;
     assert(x == 3.25);
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
   {
     std::wofstream stream(p);
     stream << 3.25;
@@ -74,7 +74,7 @@ int main(int, char**) {
     stream >> x;
     assert(x == 3.25);
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
 
   return 0;
 }

libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/open_path.pass.cpp

@@ -50,7 +50,7 @@ int main(int, char**) {
     fs >> c;
     assert(c == 'a');
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
   {
     std::wofstream fs;
     assert(!fs.is_open());
@@ -67,7 +67,7 @@ int main(int, char**) {
     fs >> c;
     assert(c == L'a');
   }
-  std::remove(p.c_str());
+  std::remove(p.string().c_str());
 
   return 0;
 }