More fixes to the tests. Add UTF-8 encoding to all locales that don't specify one. Undefine some stdio.h macros that break the tests.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@140252 91177308-0d34-0410-b5e6-96231b3b80d8

test/input.output/file.streams/c.files/cstdio.pass.cpp

@@ -76,6 +76,30 @@
 #error stdout not defined
 #endif
 
+// As an optimisation, these may be defined as macros in the C header.  We want
+// to check the functions, not the macros.
+#ifdef puts
+#undef puts
+#endif
+#ifdef putc
+#undef putc
+#endif
+#ifdef getc
+#undef getc
+#endif
+#ifdef putchar
+#undef putchar
+#endif
+#ifdef clearerr 
+#undef clearerr
+#endif
+#ifdef feof
+#undef feof
+#endif
+#ifdef ferror
+#undef ferror
+#endif
+
 #include <cstdarg>
 
 int main()