gdb: update to version 7.8, fix musl build

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 42979

package/devel/gdb/patches/100-musl_fix.patch

@@ -0,0 +1,28 @@
+--- a/gdb/linux-nat.c
++++ b/gdb/linux-nat.c
+@@ -17,6 +17,7 @@
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+ 
++#include "stopcode.h"
+ #include "defs.h"
+ #include "inferior.h"
+ #include "infrun.h"
+@@ -81,6 +82,10 @@
+ # endif
+ #endif /* HAVE_PERSONALITY */
+ 
++#ifndef __SIGRTMIN
++#define __SIGRTMIN SIGRTMIN
++#endif
++
+ /* This comment documents high-level logic of this file.
+ 
+ Waiting for events in sync mode
+--- /dev/null
++++ b/gdb/stopcode.h
+@@ -0,0 +1,4 @@
++#ifndef W_STOPCODE
++#define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
++#endif
++