Added support for shell (and csh as well) patterns for required

dependencies, as specified in blueprint "improved-version-matching".

It's possible now to require greater, greater or equal than,
less, less or equal than, and equal pkg versions, as well as using
'{}' and '[^!]' csh patterns in dependencies.

Code lifted from FreeBSD, thanks! :-)

Change XBPS_RELVER to 20091107 to match latest additions.

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091107035620-3051wcwrirqn2g14

lib/Makefile

@@ -13,7 +13,7 @@ OBJS = fetch/common.o fetch/fetch.o fetch/file.o fetch/ftp.o fetch/http.o
 OBJS +=	configure.o cmpver.o depends.o download.o fexec.o findpkg.o
 OBJS +=	humanize_number.o orphans.o plist.o purge.o register.o remove.o
 OBJS +=	repository.o requiredby.o sha256.o sortdeps.o state.o
-OBJS +=	sync_remote_pkgidx.o unpack.o util.o
+OBJS +=	sync_remote_pkgidx.o unpack.o util.o pkgmatch.o
 
 ifdef STATIC
 all: libfetch libxbps.a