This allows dylib to correctly find the library and fixes linking on OSX.

While iterating over all the keys stored in the source Dictionary
to copy them to create the copied Dictonary, the name of the key
being copied was only set to a non-NULL value for the first key
we copy. This was then leading to an assertion when trying to
create a std::string from a NULL pointer. Simple test-case:

int main()
{
	PList::Dictionary a;
	PList::String b("Hello");
	PList::String c("Hi!");
	PList::Dictionary d;

	a.Insert("Key", &b);
	a.Insert("Another Key", &c);
	std::cout << a.ToXml() << std::endl;

	d.Insert("dictionary", &a); //CRAAAAAAAAASH!
	std::cout << d.ToXml() << std::endl;
	return 0;
}
/* Output:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Key</key>
	<string>Hello</string>
	<key>Another Key</key>
	<string>Hi!</string>
</dict>
</plist>

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct NULL not valid
*/

Signed-off-by: Martin Szulecki <opensuse@sukimashita.com>

Apple's activation server refuses XML tickets when this patch isn't applied.

 - endianness issues: on big endian machines, writing out only part
   of an integer was broken (get_needed_bytes(x) < sizeof(x))
    -> shift integer before memcpy() on big endian machines

 - alignment issues: unaligned reads when loading binary plist. Leads
   to slow runtime performance (kernel trapping and fixing things up),
   SIGBUS (kernel not helping us out)
    -> introduce get_unaligned() and have the compiler generate the code
       needed for the unaligned access
   (note that there remains unaligned accesses that I haven't been able
    to track down - I've seen 2 of them with test #2)

 - type-punning issues: breaking strict aliasing rules can lead to
   unexpected results as the compiler takes full advantage of the aliasing
   while optimizing
    -> introduce the plist_uint_ptr union instead of casting pointers

Tested on amd64, alpha and hppa.

In locales like German, a ',' is used as a decimal separator. When the
program calling plist_to_xml uses LC_NUMBER with something different
than a '.', parsing of the resulting XML document fails. This patch
fixes it.

This makes it possible to process the resulting char* directly as
a c-string without further copying.

* on armel system floating poing data can have different endianess than
  rest of types; hence we fix arm endianess for defined(__VFP_FP__) to
  be big/native; this also applies for data parsing/writing
* date parsing didnt flip the endianess back for little endian systems
  when reading the values causing test failures; we fix this by ensuring
  float endianess is applied when parsing