jack: unbreak musl build, patch from Alpine.

srcpkgs/jack/patches/fix-execinfo.patch

@@ -0,0 +1,24 @@
+--- dbus/sigsegv.c
++++ dbus/sigsegv.c
+@@ -11,6 +11,8 @@
+  * Copyright (C) 2005 - 2008 Jaco Kroon
+  */
+ 
++#ifdef __GLIBC__
++
+ #if defined(HAVE_CONFIG_H)
+ #include "config.h"
+ #endif
+@@ -209,4 +211,12 @@
+ static void __attribute((constructor)) init(void) {
+     setup_sigsegv();
+ }
++#endif
++
++#else
++
++int setup_sigsegv() {
++    return 1;
++}
++
+ #endif

srcpkgs/jack/template

@@ -1,7 +1,7 @@
 # Template file for 'jack'
 pkgname=jack
 version=1.9.10
-revision=5
+revision=6
 # XXX libffado (firewire)
 hostmakedepends="pkg-config python"
 makedepends="eigen opus-devel libsamplerate-devel readline-devel dbus-devel celt-devel"