exiv2: Update version from 0.21.1 to 0.26

Hard-code the part *trunk* in the archive name in the source URL.

exiv2.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION exiv2-0.21.1-0
+# BEE_VERSION exiv2-0.26-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)
@@ -9,7 +9,7 @@
 ## The source URL(s) define the location of the sources that will be
 ## downloaded. Version variables may be used to simplify reuse of this bee-file.
 
-SRCURL[0]="http://www.exiv2.org/builds/exiv2-${PKGVERSION}.tar.gz"
+SRCURL[0]="http://www.exiv2.org/builds/exiv2-${PKGVERSION}-trunk.tar.gz"
 
 ###############################################################################
 ## Add URLs/pathes to patch files to the PATCHURL array.