[klibc] Fix segfault on ppc

[Jeff Bailey]

The SVR4 ABI PPC supplement isn't considered canonical on Linux.
Instead this arch uses the LSB ABI documents.  r7 is not guaranteed to
be initialised to any particular value, and the termination function
pointer is not provided at all.

I still have a couple more archs to test, don't rush out 1.1.5 yet. ;)

--- klibc-1.1.3.orig/klibc/arch/ppc/crt0.S
+++ klibc-1.1.3/klibc/arch/ppc/crt0.S
@@ -12,9 +12,12 @@
        /*
         * the SVR4abippc.pdf specifies r7 as a pointer to
         * a termination function pointer.
-        * It is unused on Linux.
+         * However, Section 8.4.1 of the LSB API docs say that
+         * The value to be placed into register r7, the termination
+         * function pointer, is not passed to the process.
+         * So we stub it out, instead.
         */
-       mr      4,7
+       li      4,0
        bl      __libc_init

        .size _start,.-_start


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