LLVM Minix changes

- import libcxx
 - reduce targets to the one when compiled as a tools

Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496

drivers/hello/hello.c

@@ -52,11 +52,12 @@ static ssize_t hello_read(devminor_t UNUSED(minor), u64_t position,
     u64_t dev_size;
     char *ptr;
     int ret;
+    char *buf = HELLO_MESSAGE;
 
     printf("hello_read()\n");
 
     /* This is the total size of our device. */
-    dev_size = (u64_t) strlen(HELLO_MESSAGE);
+    dev_size = (u64_t) strlen(buf);
 
     /* Check for EOF, and possibly limit the read size. */
     if (position >= dev_size) return 0;		/* EOF */
@@ -64,7 +65,7 @@ static ssize_t hello_read(devminor_t UNUSED(minor), u64_t position,
         size = (size_t)(dev_size - position);	/* limit size */
 
     /* Copy the requested part to the caller. */
-    ptr = HELLO_MESSAGE + (size_t)position;
+    ptr = buf + (size_t)position;
     if ((ret = sys_safecopyto(endpt, grant, 0, (vir_bytes) ptr, size)) != OK)
         return ret;
 

drivers/memory/Makefile

@@ -10,8 +10,8 @@ OBJS=	${SRCS:N*.h:R:S/$/.o/g}
 MKBUILDEXT2RD?=	no
 
 RAMDISK_PATH= ${NETBSDSRCDIR}/drivers/ramdisk
-DPADD+=	${LIBBLOCKDRIVER} ${LIBCHARDRIVER} ${LIBSYS}
-LDADD+=	-lblockdriver -lchardriver -lsys
+DPADD+=	${LIBBLOCKDRIVER} ${LIBCHARDRIVER}
+LDADD+=	-lblockdriver -lchardriver
 
 MAN=