chunkd and ppc[64] progress

[Jeff Garzik <jeff@garzik.org>]

I didn't want the endian issue to linger for too long, so I went ahead 
and applied the s/32/64/ portion of Pete's chunkd endian fix proposed 
patch (commit 468e7e393a6e12a410e1ab788c0beeb751c0225e).

As mentioned, I created type-safe static inline wrappers for the GLib 
endian conversion functions.  These were added to cld in 
include/cld-private.h, and to chunkd in include/chunk-private.h.

The Fedora ppc/ppc64 build definitely proceeds, getting farther but not 
100% of the way.  Here's the koji scratch build I just performed: 
http://koji.fedoraproject.org/koji/taskinfo?taskID=1595728

build log that shows ppc build failure:
http://koji.fedoraproject.org/koji/getfile?taskID=1595729&name=build.log
which shows
	[...]
	test failed on line 37
	FAIL: large-object
	      lotsa-objects PUT: 2104.63 ops/sec
	      lotsa-objects syncing...
	test failed on line 58
	FAIL: lotsa-objects

build log that shows ppc64 build failure:
http://koji.fedoraproject.org/koji/getfile?taskID=1595731&name=build.log
which shows
	[...]
	      large-object PUT: 111.06 MB/sec
	chunkd[7298]: client ::ffff:127.0.0.1 error NoSuchKey
	chunkd[7298]: client ::ffff:127.0.0.1 error InvalidArgument
	chunkd[7298]: client ::ffff:127.0.0.1 connected
	test failed on line 118
	FAIL: large-object
	chunkd[7298]: client ::ffff:127.0.0.1 connected
	chunkd[7298]: client ::ffff:127.0.0.1 error NoSuchKey
	test failed on line 41
	FAIL: lotsa-objects

But hey...  it gets farther than my previous chunkd builds on ppc, and 
Pete definitely found an endian conversion bug.

	Jeff