xrootd: update to 4.9.1

science/xrootd/Portfile

@@ -7,9 +7,9 @@ PortGroup           github                      1.0
 PortGroup           cxx11                       1.1
 PortGroup           legacysupport               1.0
 
-github.setup        xrootd xrootd 4.9.0 v
+github.setup        xrootd xrootd 4.9.1 v
 version             ${github.version}
-revision            1
+revision            0
 
 livecheck.version   ${version}
 livecheck.type      regex
@@ -29,9 +29,9 @@ platforms           darwin
 
 homepage            http://xrootd.org/
 
-checksums           rmd160  eee3b6dbd98fb8de4c25f51a6e1576934d04e3d7 \
-                    sha256  44f7bbfa34bcaa278d1e8641c2b31618ef5c6ef588a950b369e2ed43657e6c57 \
-                    size    2548614
+checksums           rmd160  b95c010dc952b641cae07805259a8c1ad689872b \
+                    sha256  712fd994ac317da1dd849334f407a57ef600e941e1b989d0922dc1bb9771c952 \
+                    size    2554863
 
 depends_build-append    port:cctools
 
@@ -47,7 +47,7 @@ cmake.out_of_source yes
 compiler.blacklist-append *gcc* {clang < 900} macports-clang-3.3 macports-clang-3.4 \
                            macports-clang-3.7 macports-clang-4.0 macports-clang-3.9 \
                            macports-clang-5.0
-compiler.whitelist clang macports-clang-7.0 macports-clang-6.0 
+compiler.whitelist clang macports-clang-8.0 macports-clang-7.0 macports-clang-6.0 
 
 # Note that we are forcing this choice. This means that anything linking
 # against root6 needs to also be using libc++.  This is possibly