[ILUG] Executable modified by rpm?

[isdtor]

I'm trying to build a CentOS5 rpm of the latest skype beta. While the
skype binary from the rpm source works fine standalone,
the binary from the install rpm dumps core and is also not identical
to the original.

$ tar xjf ~/skype_static-2.1.0.81.tar.bz2
$ mkdir rpm
$ cd rpm
$ rpm2cpio /usr/src/redhat/RPMS/i386/skype_static-2.1.0.81-1.el5.i386.rpm
|cpio -dim
59886 blocks
$ cd ..
$ cmp skype_static-2.1.0.81/skype rpm/usr/bin/skype
skype_static-2.1.0.81/skype rpm/usr/bin/skype differ: char 44636, line 43
$ ./rpm/usr/bin/skype
Segmentation fault
$

I cannot figure out how the binary gets changed. The only operation in
the spec file that touches it is an install command.
That leaves rpm.