Allow overriding what archs to build for, or what version to target, for MACOS_REDIST builds

build-lldb-mi.sh

@@ -103,8 +103,17 @@ if [ -n "$HOST" ]; then
 fi
 
 if [ -n "$MACOS_REDIST" ]; then
-    CMAKEFLAGS="$CMAKEFLAGS -DCMAKE_OSX_ARCHITECTURES=arm64;x86_64"
-    CMAKEFLAGS="$CMAKEFLAGS -DCMAKE_OSX_DEPLOYMENT_TARGET=10.9"
+    : ${MACOS_REDIST_ARCHS:=arm64 x86_64}
+    : ${MACOS_REDIST_VERSION:=10.9}
+    ARCH_LIST=""
+    for arch in $MACOS_REDIST_ARCHS; do
+        if [ -n "$ARCH_LIST" ]; then
+            ARCH_LIST="$ARCH_LIST;"
+        fi
+        ARCH_LIST="$ARCH_LIST$arch"
+    done
+    CMAKEFLAGS="$CMAKEFLAGS -DCMAKE_OSX_ARCHITECTURES=$ARCH_LIST"
+    CMAKEFLAGS="$CMAKEFLAGS -DCMAKE_OSX_DEPLOYMENT_TARGET=$MACOS_REDIST_VERSION"
 fi
 
 cd lldb-mi