This is just a reminder: npviewer.bin in the future will need a dynamic link to libcurl of its own arch. While npviewer.bin itself might not actually use any symbols in libcurl, certain plugins will have the expectation that they be there or they will simply crash. We will need this in F-8+ and RHEL5+ nspluginwrapper.
NOTE: Adding this actually creates no difference to the installed system since users would already have it installed for other reasons. This just guarantees that it will work instead of leaving it up to chance.
If it's really needed, so be it, but the assumption in comment 1 does not always hold. The only "other reason" I have libcurl.i386 and its dependency chain installed on my x86_64 box is nspluginwrapper.i386, or more specifically, nppviewer in it. See bug 456111 for more info.
nspluginwrapper-1.1.0-6 did this in the wrong way. Requires: libcurl will not guarantee that you have the corresponding arch to match both archs of nspluginwrapper. This needs a multilib compatible requirement on libcurl.so.4 or libcurl.so.4()(64bit). I suspect this can be achieved either with a dynamic link to libcurl.so.4 from npviewer.bin, or perhaps with ugly hard coded Requires in the nspluginwrapper package. Requiring libcurl package by name does not work. I'm removing this from -8 (which also reverts the breakage of -7).
/usr/lib/nspluginwrapper/npplayer libcurl.so.4 => /usr/lib/libcurl.so.4 (0x00320000) Interesting, it turns out that nspluginwrapper already does pull in libcurl of its own arch from this binary. Is this an accident? Perhaps we should add a dynamic link to libcurl from npviewer.bin explicitly just to be sure it wont disappear sometime in the future.
See comment 2 and bug 456111. If you want to add the explicit libcurl dependency anyway, specifying it as "Requires: libcurl%{?_isa}" would ensure correct arch in F-10+ (and would not hurt earlier distro versions, but wouldn't help them either).
Honestly it's a problem in flash - firefox and other browsers don't require libcurl so i don't see any reason why nspluginwrapper should demand it just for the one broken plugin. Closing as NOTABUG.