Do not allow scrypt to ignore RLIMIT_DATA

scrypt estimates the amount of available RAM, and ignores RLIMIT_DATA on
systems which have mmap. From tedu@ (http://mail.tarsnap.com/scrypt/msg00263.html):

"...this is the wrong thing to do for OpenBSD. On OpenBSD, rlimit_data
is applied to anonymous mmap (since that's now the heap) for
consistency.  RLIMIT_RSS is a vestigal do nothing define."

Issue is fixed by reverting 2b478e7ce5

While here set COMPILER and COMPILER_LANGS to fix building on sparc64
and powerpc (from kmos@, and tested by kmos@ and cwen@).

OK cwen@, "patch looks good to me" tedu@

security/scrypt/Makefile

@@ -1,8 +1,9 @@
-# $OpenBSD: Makefile,v 1.10 2019/12/31 07:26:59 bket Exp $
+# $OpenBSD: Makefile,v 1.11 2020/01/12 17:25:37 bket Exp $
 
 COMMENT =	command-line encryption using scrypt key derivation function
 
 DISTNAME =	scrypt-1.3.0
+REVISION =	0
 
 SHARED_LIBS +=	scrypt-kdf                0.0 # 1.0
 
@@ -18,6 +19,9 @@ WANTLIB =	c crypto
 MASTER_SITES =	${HOMEPAGE}
 EXTRACT_SUFX =	.tgz
 
+COMPILER =		base-clang ports-gcc
+COMPILER_LANGS =	c
+
 CONFIGURE_STYLE =	gnu
 CONFIGURE_ARGS =	--enable-libscrypt-kdf
 

security/scrypt/patches/patch-lib_util_memlimit_c

@@ -0,0 +1,24 @@
+$OpenBSD: patch-lib_util_memlimit_c,v 1.1 2020/01/12 17:25:37 bket Exp $
+
+Do not ignore RLIMIT_DATA on OpenBSD. Revert
+https://github.com/Tarsnap/scrypt/commit/2b478e7ce590a6564d89417ddad4f3dd4bbdcaf6
+
+Index: lib/util/memlimit.c
+--- lib/util/memlimit.c.orig
++++ lib/util/memlimit.c
+@@ -167,14 +167,12 @@ memlimit_rlimit(size_t * memlimit)
+ 		memrlimit = (uint64_t)rl.rlim_cur;
+ #endif
+ 
+-#ifndef HAVE_MMAP
+-	/* ... RLIMIT_DATA (if we're not using mmap)... */
++	/* ... RLIMIT_DATA... */
+ 	if (getrlimit(RLIMIT_DATA, &rl))
+ 		return (1);
+ 	if ((rl.rlim_cur != RLIM_INFINITY) &&
+ 	    ((uint64_t)rl.rlim_cur < memrlimit))
+ 		memrlimit = (uint64_t)rl.rlim_cur;
+-#endif
+ 
+ 	/* ... and RLIMIT_RSS. */
+ #ifdef RLIMIT_RSS