Import NetBSD tools and build.sh

This commit finalizes support for cross compilation. The tools
directory are all links to the actual tools and are built on the
host system to build Minix. build.sh is the work horse that takes
care of all environment settings. It's slightly adjusted for Minix.
The /usr/src/Makefile has additional targets needed for cross
compilation.

tools/binutils/patches/patch-an

@@ -0,0 +1,15 @@
+$NetBSD$
+
+--- gas/config/tc-i386.h.orig	Mon Feb 27 15:35:37 2006
++++ gas/config/tc-i386.h
+@@ -59,6 +59,10 @@ extern unsigned long i386_mach (void);
+ #define ELF_TARGET_FORMAT	"elf32-i386-vxworks"
+ #endif
+ 
++#ifdef TE_MINIX
++#define ELF_TARGET_FORMAT      "elf32-i386-minix"
++#endif
++
+ #ifndef ELF_TARGET_FORMAT
+ #define ELF_TARGET_FORMAT	"elf32-i386"
+ #endif