julia: test arm64 linux

Author: cho-m

Formula/j/julia.rb

@@ -111,7 +111,11 @@ def install
                         haswell,-rdrnd,base(1)
                         x86-64-v4,-rdrnd,base(1)]
     end
-    args << "JULIA_CPU_TARGET=#{cpu_targets.join(";")}"
+    if OS.linux? && Hardware::CPU.arm?
+      args << "prefix=#{libexec}" # skip clean
+    else
+      args << "JULIA_CPU_TARGET=#{cpu_targets.join(";")}"
+    end
     user = begin
       tap.user
     rescue
@@ -152,6 +156,9 @@ def install
 
     system "make", *args, "install"
 
+    # FIXME: TESTING
+    return if OS.linux? && Hardware::CPU.arm?
+
     if OS.linux?
       # Replace symlinks referencing Cellar paths with ones using opt paths
       deps.reject(&:build?).map(&:to_formula).map(&:opt_lib).each do |libdir|