Bug#885107: engrampa FTCBFS: tries to pass empty -rpath

[Helmut Grohne]

Source: engrampa
Version: 1.18.3-1
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

engrampa fails to cross build from source, because it tries to pass an
empty -rpath to libtool, which fails. The empty value comes the
CAJA_EXTENSION_DIR variable which is seeded from a bare pkg-config
invocation. configure.ac derives ac_with_cajadir without checking the
return code, but since it uses the build architecture pkg-config unlike
the earlier check performed with the host architecture pkg-config, the
invocation fails. Switching to the host architecture pkg-config (seeded
from PKG_PROG_PKG_CONFIG into $PKG_CONFIG) makes the cross build
succeed. Please consider applying the attached patch.

Helmut
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