Tweaks to get trousers to build.
Tweaks to get tpm-tools to build.
Tweaks to get lvm2 to compile.
Tweaks to get linux-v4v-headers to build.
Check if headers exist before attempting to install them.
Tweaks to get libxenacpi to build.
Tweaks to get libxclogging to build.
libgcrypt to 1.6.1.  Required a bit of patch refactoring as libgcrypt handles
method visibility differently now.  Utlimately still need to see that nothing
is broken down the line.