Create the prefixless objcopy/strip tools from an executable

This is necessary since 62b208a.

install-wrappers.sh

@@ -69,10 +69,10 @@ if [ -n "$EXEEXT" ]; then
     if [ -z "$HOST" ]; then
         HOST=$(./clang-$CLANG_MAJOR -dumpmachine | sed 's/-.*//')-w64-mingw32
     fi
-    for exec in clang clang++ gcc g++ cc c99 c11 c++ ar ranlib nm strings widl windres; do
+    for exec in clang clang++ gcc g++ cc c99 c11 c++ ar ranlib nm objcopy strings strip widl windres; do
         ln -sf $HOST-$exec$EXEEXT $exec$EXEEXT
     done
-    for exec in ld objdump dlltool objcopy strip; do
+    for exec in ld objdump dlltool; do
         ln -sf $HOST-$exec $exec
     done
 fi