sbcl-bootstrap: update powerpc boot binary to 2.4.6

lang/sbcl-bootstrap/Portfile

@@ -21,13 +21,13 @@ homepage http://www.sbcl.org
 use_bzip2 yes
 
 if {${build_arch} eq "ppc"} {
- version 1.0.47
+ version 2.4.6
  revision 0
 
- distfiles sbcl-${version}-powerpc-darwin-binary${extract.suffix}
- checksums rmd160 85c76296a1c62db5affdff7e72e61e558bb5c819 \
- sha256 6971a64c0706894f217da676081874088f50f84daa66d89b653b065f83563f3b \
- size 8217590
+ distfiles sbcl-${version}-powerpc-darwin-binary${extract.suffix}:macppc
+ checksums rmd160 361a26c6fd929bb8062973e9296ed20245a4d86e \
+ sha256 20edb91e641cd956c1515746c02695f13c0b22679129dae7de84e9ac0ef080db \
+ size 7705023
 
 } elseif {${build_arch} eq "i386"} {
  version 1.1.6
@@ -75,6 +75,9 @@ if {${build_arch} eq "ppc"} {
 
 master_sites sourceforge:project/sbcl/sbcl/${version}
 
+# https://sourceforge.net/p/sbcl/mailman/message/58774549/
+master_sites-append https://macos-powerpc.org/compilers/sbcl/boot/:macppc
+
 extract.rename yes
 use_configure no