z3: bump version to 4.12.6

4.12.6 is the latest version released last week.
The main motivation for the upgrade, though, is to get past 4.12.3,
as subsequent versions (4.12.4 onward) support aarch64 for Linux.

rosette/private/install.rkt

@@ -20,7 +20,7 @@
 ; far more obvious.
 (define z3-install-failure #f)
 
-(define z3-version "4.8.8")
+(define z3-version "4.12.6")
 
 (define (print-failure path msg)
   (printf "\n\n********** Failed to install Z3 **********\n\n")
@@ -66,19 +66,17 @@
          (not (equal? (resolve-path p) p)))))
 
 (define (get-z3-url)
-  ; TODO: Z3 packages a macOS aarch64 binary as of 4.8.16, so remove this special case when we update
-  ; to a newer Z3 version.
-  (if (and (equal? (system-type 'os*) 'macosx) (equal? (system-type 'arch) 'aarch64))
-      (values "https://github.com/emina/rosette/releases/download/4.1/z3-4.8.8-aarch64-osx-13.3.1.zip" "z3")
-      (let ()
-        (define site "https://github.com/Z3Prover/z3/releases/download")
-        (define-values (os exe)
-          (match (list (system-type 'os*) (system-type 'arch))
-            ['(linux x86_64)   (values "x64-ubuntu-16.04" "z3")]
-            [`(macosx ,_)      (values "x64-osx-10.14.6" "z3")]
-            ['(windows x86_64) (values "x64-win" "z3.exe")]
-            [any               (raise-user-error 'get-z3-url "No Z3 binary available for system type '~a" any)]))
-        (define name (format "z3-~a-~a" z3-version os))
-        (values
-         (format "~a/z3-~a/~a.zip" site z3-version name)
-         (format "~a/bin/~a" name exe)))))
+  (define site "https://github.com/Z3Prover/z3/releases/download")
+  (define-values (os exe)
+    (match (list (system-type 'os*) (system-type 'arch))
+      ['(linux x86_64)    (values "x64-glibc-2.35" "z3")]
+      ['(linux aarch64)   (values "arm64-glibc-2.35" "z3")]
+      ['(macosx x86_64)   (values "x64-osx-11.7.10" "z3")]
+      ['(macosx aarch64)  (values "arm64-osx-11.0" "z3")]
+      ['(windows x86_64)  (values "x64-win" "z3.exe")]
+      ['(windows aarch64) (values "arm64-win" "z3.exe")]
+      [any               (raise-user-error 'get-z3-url "No Z3 binary available for system type '~a" any)]))
+  (define name (format "z3-~a-~a" z3-version os))
+  (values
+   (format "~a/z3-~a/~a.zip" site z3-version name)
+   (format "~a/bin/~a" name exe)))