Fix MRP build problem on Ubuntu 10.10 x64, GCC 4.4.4-14ubuntu5. Defining __USE_GNU directly in source code apparently didn't work in this configuration.

mrp_gnu_source.patch

diff --git a/tools/bootloader/sysSignal_Intel.c b/tools/bootloader/sysSignal_Intel.c
index c283e96..d7d04fa 100755
--- a/tools/bootloader/sysSignal_Intel.c
+++ b/tools/bootloader/sysSignal_Intel.c
@@ -14,6 +14,14 @@
  */
 
 /*
+ * Define the _GNU_SOURCE macro before first include header,
+ * instead of defining glibc's internal macro __USE_GNU.
+ */
+#ifdef RVM_FOR_LINUX
+#define _GNU_SOURCE 1
+#endif
+
+/*
  * Architecture specific signal handling routines
  */
 #include "sys.h"
@@ -21,7 +29,6 @@
 
 /* Macros to modify signal context */
 #ifdef RVM_FOR_LINUX
-#define __USE_GNU 1
 #include <sys/ucontext.h>
 #define __MC(context) ((ucontext_t*)context)->uc_mcontext
 #define __GREGS(context) (__MC(context).gregs)