Update fossil to 2.20.

Release notes: https://fossil-scm.org/home/doc/trunk/www/changes.wiki#v2_20

devel/fossil/Makefile

@@ -1,15 +1,14 @@
 COMMENT =		simple distributed software configuration management
 
-DISTNAME =		fossil-2.18
+DISTNAME =		fossil-2.20
 EPOCH =			0
-REVISION =		0
 CATEGORIES =		devel www
 
 MAINTAINER =		James Turner <james@calminferno.net>
 
 HOMEPAGE =		https://fossil-scm.org/
 MASTER_SITES =		https://fossil-scm.org/home/tarball/
-DISTFILES =		{84f25d7eb10c0714109d69bb2809abfa8b4b5c3d73b151a5b10df724dacd46d8/}${DISTNAME}${EXTRACT_SUFX}
+DISTFILES =		{210e89a0597f225f49722b096cf5563bf193e920e02a9bd38503a906deacd416/}${DISTNAME}${EXTRACT_SUFX}
 
 
 # BSD

devel/fossil/distinfo

@@ -1,2 +1,2 @@
-SHA256 (fossil-2.18.tar.gz) = 6Jy5xyY0i7FOdzbgMdKwhXRAjF1NuY59P8gU2txvNUY=
-SIZE (fossil-2.18.tar.gz) = 6308204
+SHA256 (fossil-2.20.tar.gz) = A8oTTx6DmqK8+/98XqlmBymfVr4OFNl9TcOhnEFxzs4=
+SIZE (fossil-2.20.tar.gz) = 6721683

devel/fossil/patches/patch-auto_def

@@ -1,7 +1,7 @@
 Index: auto.def
 --- auto.def.orig
 +++ auto.def
-@@ -299,7 +299,7 @@ if {[opt-bool with-th1-hooks]} {
+@@ -300,7 +300,7 @@ if {[opt-bool with-th1-hooks]} {
  
  if {[opt-bool static]} {
      # XXX: This will not work on all systems.