examples: remove obsolete workaround for mingw

The build still succeeds with the workaround removed, so
whatever was causing the problem no longer exists.
Reviewed-by: NPavel Hrdina <phrdina@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

examples/c/domain/domtop.c

@@ -34,21 +34,6 @@
 static bool debug;
 static bool run_top;
 
-/* On mingw, there's a header file that poisons the well:
- *
- *
- *  CC       domtop.o
- *domtop.c:40:0: warning: "ERROR" redefined [enabled by default]
- * #define ERROR(...) \
- * ^
- *In file included from /usr/i686-w64-mingw32/sys-root/mingw/include/windows.h:71:0,
- *                 from /usr/i686-w64-mingw32/sys-root/mingw/include/winsock2.h:23,
- *                 from ../../gnulib/lib/unistd.h:48,
- *                 from domtop.c:35:
- * /usr/i686-w64-mingw32/sys-root/mingw/include/wingdi.h:75:0: note: this is the location of the previous definition
- * #define ERROR 0
- */
-#undef ERROR
 #define ERROR(...) \
 do { \
     fprintf(stderr, "ERROR %s:%d : ", __FUNCTION__, __LINE__); \

examples/c/domain/suspend.c

@@ -30,20 +30,6 @@
 
 static int debug;
 
-/* On mingw, there's a header file that poisons the well:
- *
- *
- *  CC       domtop.o
- *domtop.c:40:0: warning: "ERROR" redefined [enabled by default]
- * #define ERROR(...) \
- * ^
- *In file included from /usr/i686-w64-mingw32/sys-root/mingw/include/windows.h:71:0,
- *                 from /usr/i686-w64-mingw32/sys-root/mingw/include/winsock2.h:23,
- *                 from ../../gnulib/lib/unistd.h:48,
- *                 from domtop.c:35:
- * /usr/i686-w64-mingw32/sys-root/mingw/include/wingdi.h:75:0: note: this is the location of the previous definition
- * #define ERROR 0
- */
 #undef ERROR
 #define ERROR(...) \
 do { \