julia: manually fix code signature on arm

Closes: https://trac.macports.org/ticket/64306

Author: i0ntempest

lang/julia/Portfile

@@ -11,7 +11,7 @@ compilers.setup     require_fortran -g95
 compiler.blacklist-append {clang < 900}
 
 github.setup        JuliaLang julia 1.8.0 v
-revision            0
+revision            1
 categories-append   lang math science
 maintainers         {ieee.org:s.t.smith @essandess} openmaintainer
 platforms           darwin
@@ -97,6 +97,10 @@ post-destroot {
     delete ${destroot}${prefix}/var
 
     system -W ${destroot}${prefix}/bin "install_name_tool -add_rpath ${prefix}/lib julia"
+    if {${os.arch} eq "arm"} {
+    	# manually fix code signature on arm
+        system -W ${destroot}${prefix} "/usr/bin/codesign --sign - lib/libjulia.${short_version}.dylib"
+    }
 }
 
 pre-test {