0ad: fix build on ppc64le-musl

srcpkgs/0ad/patches/ppc-musl.patch

@@ -0,0 +1,15 @@
+On musl this is necessary to get full definition of pt_regs.
+
+--- libraries/source/nvtt/src/src/nvcore/Debug.cpp
++++ libraries/source/nvtt/src/src/nvcore/Debug.cpp
+@@ -27,6 +27,10 @@
+ #	include <signal.h>
+ #endif
+ 
++#if NV_OS_LINUX
++#	include <asm/ptrace.h> // struct pt_regs
++#endif
++
+ #if NV_OS_LINUX || NV_OS_DARWIN || NV_OS_FREEBSD || NV_OS_OPENBSD
+ #	include <unistd.h>	// getpid
+ #endif