x32: fix sysinfo()

the kernel uses long longs in the struct, but the documentation
says they're long. so we need to fixup the mismatch between the
userspace and kernelspace structs.
since the struct offers a mem_unit member, we can avoid truncation
by adjusting that value.

src/linux/x32/sysinfo.s

@@ -0,0 +1,5 @@
+.text
+.global sysinfo
+.type   sysinfo,@function
+sysinfo:
+	jmp __x32_sysinfo