ltrace: fix build on ppc*-musl

srcpkgs/ltrace/patches/musl-ppc.patch

@@ -0,0 +1,36 @@
+--- sysdeps/linux-gnu/ppc/regs.c
++++ sysdeps/linux-gnu/ppc/regs.c
+@@ -27,7 +27,9 @@
+ #include <sys/ptrace.h>
+ #include <asm/ptrace.h>
+ #include <errno.h>
++#ifdef __GLIBC__
+ #include <error.h>
++#endif
+ 
+ #include "proc.h"
+ #include "common.h"
+@@ -50,7 +52,13 @@ void
+ set_instruction_pointer(struct process *proc, void *addr)
+ {
+ 	if (ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_NIP, addr) != 0)
++	{
++#ifdef __GLIBC__
+ 		error(0, errno, "set_instruction_pointer");
++#else
++		fprintf(stderr, "set_instruction_pointer: %s\n", strerror(errno));
++#endif
++	}
+ }
+ 
+ void *
+--- sysdeps/linux-gnu/ppc/trace.c
++++ sysdeps/linux-gnu/ppc/trace.c
+@@ -24,6 +24,7 @@
+ 
+ #include "config.h"
+ 
++#include <asm/ptrace.h>
+ #include <assert.h>
+ #include <elf.h>
+ #include <errno.h>

srcpkgs/ltrace/template

@@ -17,14 +17,13 @@ checksum=4aecf69e4a33331aed1e50ce4907e73a98cbccc4835febc3473863474304d547
 CFLAGS="-Wno-error -D_GNU_SOURCE"
 
 pre_configure() {
-	case "$XBPS_TARGET_MACHINE" in
-	*-musl)
+	if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
 		sed -i '/HOST_OS/s/linux-uclibc/linux-musl/g' configure.ac
 		sed -i -e '/error.h/d' -e 's/error(1, errno/err(1/' \
 			read_config_file.c expr.c zero.c
 		sed -i '1i#include <sys/types.h>' proc.h
 		sed -i 's/#ifndef __mips__/#if 0/' proc.c
-	esac
+	fi
 
 	autoreconf -fi
 }