Make fdFileno() static, use Fileno()/Ferror() analogues throughout.

Make fdFileno() static, use Fileno()/Ferror() analogues throughout.
Make ufdClose() static, use Fclose() with ufdio cookie throughout.
rpm.c: Clean urlinfoCache and rpmBuildArgs leaks.
url.c: urlIsURL() should be here, not in rpmio.c.
url.c: Preserve FD_t abstraction by creating ufdGetUrlinfo().
url.c: Create freeUrlinfoCache().
rpmio.c: Create ufdio cookie.

CVS patchset: 3407
CVS date: 1999/10/30 16:43:29