Finally fixed the loaderbug!

Programs were crashing randomly at startup on the kthread branch. After some
investigation, it turned out that the programs weren't correctly loaded by
the program loader in rare cases. Although, all investigation showed that
the program loader was correct and so was the interrupt routines (well,
almost, but nothing that could really trigger this). Yada yada, a few months
later I discovered that memcpy(3) was being corrupted by an interrupt handler
(which was correct). Turns out memcpy used stack space it hadn't allocated.
This is a Linux optimization that I had forgotten to disable with
-mno-red-zone in libmaxsi and thus interrupts just overwrote the stack of
optimized functions. Eek!

libmaxsi/Makefile

@@ -14,7 +14,7 @@ endif
 ifeq ($(CPU),x64)
     CPU=x64
     CPUDEFINES=-DPLATFORM_X64
-    CPUFLAGS=-fPIC -m64
+    CPUFLAGS=-fPIC -m64 -mno-red-zone
     CPULDFLAGS=-melf_x86_64
     CPUASFLAGS=-64
 endif