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build: Add fixes for NetBSD

NetBSD needs the same hack for ARFLAGS that OpenBSD.
Ideally we should submit a patch for NetBSD to solve
this issue because it has a good support for .POSIX.

This patch also adds a temporary hack to solve a
problem in NetBSD when POSIX_C_SOURCE and _ANSI_SOURCE
are defined at the same time. A patch was submited to
NetBSD and this hack is expected to be removed in a
future.

--- a/scripts/config

+++ b/scripts/config

@@ -4,6 +4,10 @@

 OpenBSD)

 	echo TOOL=${TOOL:-clang} HOST=bsd ARFLAGS=${ARFLAGS:--rv}

 	;;

+NetBSD)

+	#TODO: send a patch to NetBSD to solve this problem

+	echo HOST=bsd ARFLAGS=${ARFLAGS:--rv}

+	;;

 *BSD)

 	echo HOST=bsd

 	;;

--- a/src/cmd/cc/posix/cc.c

+++ b/src/cmd/cc/posix/cc.c

@@ -1,4 +1,15 @@

-#define _POSIX_SOURCE 200809L

+/*

+ * FIXME: scc is a pure C99 source code, except this file that is

+ * intended for a POSIX.2008 environment. This situation  creates

+ * a problem where some systems require the macro _ANSI_SOURCE to

+ * limit the namespace to a pure ISO namespace. NetBSD has a  bug

+ * and using POSIX_C_SOURCE  and  _ANSI_SOURCE  at  the same time

+ * generates a syntax  error in the system headers. A  patch  was

+ * sent to NetBSD, but this temporary fix is added here until the

+ * patch  arrives to the stable release.

+ */

+#define _POSIX_C_SOURCE 200809L

+#undef _ANSI_SOURCE

 #include <sys/types.h>

 #include <sys/wait.h>