kexec: ppc exec stack fix

execstack shows ppc kexec has an executable stack, this leaves it vulnerable to buffer overflows.

Fix it by adding ASFLAGS --noexecstack

Tested on PowerMac G4 Macmini:
Without the patch:

dave@darkstar:~/kexec-tools$ execstack build/sbin/kexec 
X build/sbin/kexec

With the patch:

dave@darkstar:~/kexec-tools$ execstack build/sbin/kexec 
- build/sbin/kexec

---
 kexec/arch/ppc/Makefile |    2 ++
 1 file changed, 2 insertions(+)

@@ -23,6 +23,8 @@ CPPFLAGS+=-I$(srcdir)/kexec/arch/$(ARCH)
 
 ppc_KEXEC_SRCS += $(libfdt_SRCS)
 
+ASFLAGS	+= -Wa,--noexecstack
+
 dist += kexec/arch/ppc/Makefile $(ppc_KEXEC_SRCS)			\
 	kexec/arch/ppc/crashdump-powerpc.h kexec/arch/ppc/fixup_dtb.h	\
 	kexec/arch/ppc/kexec-ppc.h kexec/arch/ppc/ops.h			\

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Thanks Dave, applied.

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