fix macOS 10.12 SDK uninstall

fixes #43

Author: devernay

XcodeLegacy.sh

@@ -1083,6 +1083,9 @@ SPEC_EOF
         if [ "$osx1011" = 1 ]; then
             rm Xcode1011SDK.tar.gz 2>/dev/null
         fi
+        if [ "$osx1012" = 1 ]; then
+            rm Xcode1012SDK.tar.gz 2>/dev/null
+        fi
 
         ;;
 
@@ -1187,6 +1190,10 @@ SPEC_EOF
             i=10.11
             [ -f "$SDKDIR/SDKs/MacOSX${i}.sdk/legacy" ] && rm -rf "$SDKDIR/SDKs/MacOSX${i}.sdk"
         fi
+        if [ "$osx1012" = 1 ]; then
+            i=10.12
+            [ -f "$SDKDIR/SDKs/MacOSX${i}.sdk/legacy" ] && rm -rf "$SDKDIR/SDKs/MacOSX${i}.sdk"
+        fi
 
         if [ "$compilers" = 1 ]; then
             if [ "$GCCINSTALLDIR/usr/bin/gcc" -ef "$GCCINSTALLDIR/usr/bin/clang" ]; then