Set glx-read-only-text on i386
    
    An update on the linker will now refuse to create binaries with a
    loadable memory segment that has read, write and execute permissions
    set.
    mesa creates one unless "glx-read-only-text" is enabled.
    
    Revert commit e2acc882a102 ("Disable rwx segment linker error") and set
    "glx-read-only-text" instead.
    
    See Nick's comment for more information about the revert:
    https://bugzilla.redhat.com/show_bug.cgi?id=2250927#c10
    
    Fix: https://bugzilla.redhat.com/show_bug.cgi?id=2250927