gcc-4.5.1: remove extra commands

Remove post-install commands, which we don't need for this version to
avoid

    + rm -v 'lib64/*-gdb.py'
    rm: cannot remove 'lib64/*-gdb.py': No such file or directory

gcc-4.5.1-0.build.sh

@@ -102,7 +102,4 @@ ln -sfv gcc bin/cc
 install -v -dm755 lib/bfd-plugins
 ln -sfv ../../libexec/gcc/$(gcc -dumpmachine)/$VERSION/liblto_plugin.so lib/bfd-plugins/
 
-# and dump these ...
-rm -v lib64/*-gdb.py
-
 exit