Clarify platform ifdef's with indenting and grouping.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8185 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

examples/howto-add_fd-and-popen.cxx

@@ -32,22 +32,22 @@
 //     http://www.fltk.org/str.php
 //
 #include <stdio.h>
-#ifdef _WIN32
-#define PING_CMD "ping -n 10 localhost"		// 'slow command' under windows
-#ifdef _MSC_VER
-#define popen _popen
-#define pclose _pclose
-#else /*_MSC_VER*/
-#include <unistd.h>				// non-MS win32 compilers (untested)
-#endif /*_MSC_VER*/
-#else
-#include <unistd.h>
-#define PING_CMD "ping -i 2 -c 10 localhost"	// 'slow command' under unix
-#endif
 #include <FL/Fl.H>
 #include <FL/Fl_Window.H>
 #include <FL/Fl_Multi_Browser.H>
 
+#ifdef _WIN32
+#  define PING_CMD "ping -n 10 localhost"	// 'slow command' under windows
+#  ifdef _MSC_VER
+#    define popen _popen
+#    define pclose _pclose
+#  else /*_MSC_VER*/
+#    include <unistd.h>				// non-MS win32 compilers (untested)
+#  endif /*_MSC_VER*/
+#else
+#  include <unistd.h>
+#  define PING_CMD "ping -i 2 -c 10 localhost"	// 'slow command' under unix
+#endif
 
 // GLOBALS
 FILE *G_fp = NULL;