[with spkg] sage make install bug

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/1752">trac #1752</a>.

When calling 
```
DESTDIR=$sagedir make install
```
the following library files will be created with 555 permissions. When causes problems when trying to strip those files. To change that, deliver the files with 755 permissions.

$sagedir/sage/local/lib/libhistory.so.*
$sagedir/sage/local/lib/libreadline.so.*

Reported by: pgrinber

Component: relocation

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