Add using namespace statement

Author: Colin Robertson

docs/build/creating-precompiled-header-files.md

@@ -169,9 +169,9 @@ UNSTABLEHDRS = unstable.h
 CLFLAGS = /c /W3
 # List all linker options common to both debug and final
 # versions of your code here:
-LINKFLAGS = /NOD /ONERROR:NOEXE
+LINKFLAGS = /nologo
 !IF "$(DEBUG)" == "1"
-CLFLAGS   = /D_DEBUG $(CLFLAGS) /Od /Zi /f
+CLFLAGS   = /D_DEBUG $(CLFLAGS) /Od /Zi
 LINKFLAGS = $(LINKFLAGS) /COD
 LIBS      = slibce
 !ELSE
@@ -260,6 +260,7 @@ void notstable( void );
 #include"another.h"
 #include"stable.h"
 #include"unstable.h"
+using namespace std;
 // The following code represents code that is deemed stable and
 // not likely to change. The associated interface code is
 // precompiled. In this example, the header files STABLE.H and