sbcl: fix build on ppc64le-musl

srcpkgs/sbcl/patches/ppc-musl.patch

@@ -8,3 +8,25 @@
  
  #include "validate.h"
  #include "ppc-linux-mcontext.h"
+--- a/src/runtime/os-common.c
++++ b/src/runtime/os-common.c
+@@ -31,6 +31,9 @@
+ #if defined(LISP_FEATURE_OS_PROVIDES_DLOPEN) && !defined(LISP_FEATURE_WIN32)
+ # include <dlfcn.h>
+ #endif
++#if defined(__powerpc__)
++# include <asm/ptrace.h>
++#endif
+ 
+ /*
+  * historically, this used sysconf to select the runtime page size
+--- a/src/runtime/ppc-arch.c
++++ b/src/runtime/ppc-arch.c
+@@ -10,6 +10,7 @@
+  */
+ 
+ #include <stdio.h>
++#include <asm/ptrace.h>
+ 
+ #include "sbcl.h"
+ #include "arch.h"