Get rid of this old turkey

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

sys/src/libauth/BUILDKLIBAUTH

@@ -1,6 +0,0 @@
-export CC=gcc
-export CFLAGS="-mcmodel=kernel -O0 -fplan9-extensions -ffreestanding -fno-builtin -Wall -Wno-missing-braces -Wno-parentheses -Wno-unknown-pragmas -Wuninitialized -Wmaybe-uninitialized -I/amd64/include -I/sys/include -c "
-rm -f *.o
-$CC $CFLAGS -c *.c 
-ar rv /amd64/lib/klibauth.a *.o
-rm *.o