isl-devel: update to 0.21, add openmaintainer

devel/isl-devel/Portfile

@@ -6,13 +6,13 @@ PortGroup           muniversal 1.0
 name                isl-devel
 conflicts           isl
 
-set gitSHA1 9f767f1766a016f04184fccb41c00a4f355df00d
-version             0.15-20150513-[string range $gitSHA1 0 6]
+set gitSHA1         f8b5d3df1e4dd2c4a300d25954d344b757347f2c
+version             0.21-20190404-[string range $gitSHA1 0 6]
 
 categories          devel math
 platforms           darwin
 license             MIT
-maintainers         {larryv @larryv}
+maintainers         {larryv @larryv} openmaintainer
 
 description         Integer Set Library
 long_description    isl is a library for manipulating sets and \
@@ -31,25 +31,20 @@ homepage            http://isl.gforge.inria.fr
 
 depends_lib         port:gmp
 
-master_sites        http://repo.or.cz/w/isl.git/snapshot
-checksums           rmd160  bf42466b3e9d1712665df1cf0771973373222cce \
-                    sha256  29a78085a269bf40bf229380d485ab903017669356491ff44016bd1c912055a3
+master_sites        http://repo.or.cz/isl.git/snapshot
+
+checksums           rmd160  e6fc61adff24de3ed764db3169467736d9c7d94f \
+                    sha256  4b47ef4320fb58079dafb4d4afaec65a3f0aa8306822560495e35f33e48030c1 \
+                    size    1162344
 
 distname            $gitSHA1
 worksrcdir          isl-[string range $gitSHA1 0 6]
 
-# Add a missing include to the isl_int headers. Upstream doesn't want to
-# bother fixing deprecated APIs
-# (https://groups.google.com/d/msg/isl-development/N6UWJDbKXNA/2CY6WHDvOYoJ),
-# so this should be applied until they remove the headers outright.
-patchfiles          fix-deprecated-headers.patch
-
 use_autoreconf      yes
 
 configure.args      --disable-silent-rules
 
 test.run            yes
 test.target         check
 
-livecheck.type      moddate
-livecheck.url       http://repo.or.cz/w/isl.git/commit/HEAD
+livecheck.type      none