strace: fix build on ppc*-musl

[ci skip]

Closes: #12363 [via git-merge-pr]

srcpkgs/strace/patches/ppc-musl.patch

@@ -0,0 +1,16 @@
+--- regs.h
++++ regs.h
+@@ -8,7 +8,13 @@
+ #ifndef STRACE_REGS_H
+ # define STRACE_REGS_H
+ 
++#if !defined(__GLIBC__) && defined(__powerpc__)
++# define pt_regs musl_pt_regs
+ # include <sys/user.h>
++# undef pt_regs
++#else
++# include <sys/user.h>
++#endif
+ # include "arch_regs.h"
+ 
+ #endif /* !STRACE_REGS_H */