gdb: fix musl patch.

Use patch from Alpine. __SIGRTMIN and SIGRTMIN aren't the same thing:
SIGRTMIN is for signals applications can use, for which musl currently
returns 35, but __SIGRTMIN is supposed to include the signals that libc
uses, where the correct value is 32.

srcpkgs/gdb/patches/gdb-linux_nat.patch

@@ -1,21 +0,0 @@
-the first chunk fixes build errors,
-the non_stop part below fixes thread debugging being available
-by default without setting any breakpoints or usage of libthread_db.
-
---- gdb-7.4.org/gdb/linux-nat.c	2013-08-10 05:24:24.651000003 +0000
-+++ gdb-7.4/gdb/linux-nat.c	2013-08-10 05:25:50.966000003 +0000
-@@ -71,6 +71,14 @@
- # endif
- #endif /* HAVE_PERSONALITY */
- 
-+#ifndef __SIGRTMIN
-+#define __SIGRTMIN SIGRTMIN
-+#endif
-+
-+#ifndef W_STOPCODE
-+#define W_STOPCODE(sig) ((sig) << 8 | 0x7f)
-+#endif
-+
- /* This comment documents high-level logic of this file.
- 
- Waiting for events in sync mode

srcpkgs/gdb/patches/gdb-signals.patch

@@ -0,0 +1,21 @@
+relevant bug:
+https://sourceware.org/bugzilla/show_bug.cgi?id=23616
+
+diff --git a/gdbsupport/signals.cc b/gdbsupport/signals.cc
+index 485e0f0..ab8d454 100644
+--- a/gdbsupport/signals.cc
++++ b/gdbsupport/signals.cc
+@@ -31,6 +31,13 @@ struct gdbarch;
+    _available_ realtime signal, not the lowest supported; glibc takes
+    several for its own use.  */
+ 
++#ifndef __SIGRTMIN
++# define __SIGRTMIN 32
++#endif
++#ifndef __SIGRTMAX
++# define __SIGRTMAX _NSIG
++#endif
++
+ #ifndef REALTIME_LO
+ # if defined(__SIGRTMIN)
+ #  define REALTIME_LO __SIGRTMIN

srcpkgs/gdb/template

@@ -1,7 +1,7 @@
 # Template file for 'gdb'
 pkgname=gdb
 version=10.1
-revision=2
+revision=3
 build_style=gnu-configure
 pycompile_dirs="/usr/share/gdb/python"
 configure_args="--disable-werror --disable-nls --with-system-readline