code style for _WIN32_WINNT

[Bruno Haible]

A minor code style change:


2017-05-13 Bruno Haible <***@clisp.org>

Use symbolic values for _WIN32_WINNT.
* lib/ftruncate.c (_WIN32_WINNT): Use symbolic value _WIN32_WINNT_WIN2K.
* lib/sethostname.c (_WIN32_WINNT): Likewise.

diff --git a/lib/ftruncate.c b/lib/ftruncate.c
index f0ecae2..3dac017 100644
--- a/lib/ftruncate.c
+++ b/lib/ftruncate.c
@@ -31,7 +31,7 @@

/* Ensure that <windows.h> declares GetFileSizeEx. */
# undef _WIN32_WINNT
-# define _WIN32_WINNT 0x500
+# define _WIN32_WINNT _WIN32_WINNT_WIN2K

/* Get declarations of the native Windows API functions. */
# define WIN32_LEAN_AND_MEAN
diff --git a/lib/sethostname.c b/lib/sethostname.c
index cb9b229..fc86ac8 100644
--- a/lib/sethostname.c
+++ b/lib/sethostname.c
@@ -89,7 +89,7 @@ sethostname (const char *name, size_t len)

/* Ensure that <windows.h> declares SetComputerNameEx. */
#undef _WIN32_WINNT
-#define _WIN32_WINNT 0x500
+#define _WIN32_WINNT _WIN32_WINNT_WIN2K

#define WIN32_LEAN_AND_MEAN