use minix malloc

. default jemalloc is not too easy to compile without threads
	  libraries/types
	. non-default malloc has odd virtual address space binge problem
	. switch to ack/minix malloc in old libc for now

lib/nbsd_libc/minix-config.inc

@@ -7,6 +7,7 @@ USE_INET6=no
 
 MKYP=no #requires RPC
 USE_JEMALLOC=no
+USE_MINIXMALLOC=yes
 USE_FORT=no
 USE_LIBTRE=no
 

lib/nbsd_libc/stdlib/Makefile.inc

@@ -42,6 +42,11 @@ SRCS+= erand48_ieee754.c
 
 .if (${USE_JEMALLOC} != "no")
 SRCS+=	jemalloc.c
+.elif (${USE_MINIXMALLOC} != "no")
+SRCS+=	\
+	${LIBCDIR}/../libc/stdlib/malloc.c	\
+	${LIBCDIR}/../libc/stdlib/calloc.c	\
+	${LIBCDIR}/../libc/stdlib/malloc-debug.c
 .else
 SRCS+=	malloc.c
 .endif