misc/xplr: Unbreak build on FreeBSD 11-{i386,amd64}

getentropy(3) did not appear until FreeBSD 12, anything lower will
not compile, throwing an undefined reference to `getentropy'.  We can
safely remove this once FreeBSD 11 is EOL.

Reported-by:	pkg-fallout

misc/xplr/Makefile

 PORTNAME=	xplr
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.14.3
-PORTREVISION=	2
+PORTREVISION=	3
 CATEGORIES=	misc
 
 MAINTAINER=	lcook@FreeBSD.org
@@ -177,4 +177,13 @@ post-install-EXAMPLES-on:
 		${INSTALL_DATA} ${_EXAMPLES} \
 		${STAGEDIR}${EXAMPLESDIR}
 
-.include <bsd.port.mk>
+.include <bsd.port.pre.mk>
+
+# XXX: getentropy(3) did not appear until FreeBSD 12, anything lower will
+# not compile, throwing an undefined reference to `getentropy'.  We can
+# safely remove this once FreeBSD 11 is EOL.
+.if ${OPSYS} == FreeBSD && ${OSVERSION} < 1200000
+EXTRA_PATCHES=	${PATCHDIR}/extra-cargo-crates_luajit-src-210.1.3+restyfe08842_luajit2_src_lj__prng.c
+.endif
+
+.include <bsd.port.post.mk>

misc/xplr/files/extra-cargo-crates_luajit-src-210.1.3+restyfe08842_luajit2_src_lj__prng.c

+--- cargo-crates/luajit-src-210.1.3+restyfe08842/luajit2/src/lj_prng.c.orig	2021-07-11 17:23:58 UTC
++++ cargo-crates/luajit-src-210.1.3+restyfe08842/luajit2/src/lj_prng.c
+@@ -116,7 +116,7 @@ static PRGR libfunc_rgr;
+ #define LJ_TARGET_HAS_GETENTROPY	1
+ #endif
+ #elif LJ_TARGET_BSD || LJ_TARGET_SOLARIS || LJ_TARGET_CYGWIN
+-#define LJ_TARGET_HAS_GETENTROPY	1
++#define LJ_TARGET_HAS_GETENTROPY	0
+ #endif
+ 
+ #if LJ_TARGET_HAS_GETENTROPY