Bug#886578: mate-user-share FTCBFS: wrongly uses pkg-config

[Helmut Grohne]

Source: mate-user-share
Version: 1.18.0-1.1
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap

mate-user-share fails to cross build from source, because it wrongly
uses pkg-config. The attached patch fixes all the issues and makes it
cross build. Let me briefly discuss the hunks:

* Using AC_PATH_PROG results in not considering $ac_tool_prefix. This
  generally breaks cross compilation. AC_PATH_TOOL is an improvement,
  but PKG_PROG_PKG_CONFIG is the correct upstream macro to use.

* Using PKG_CHECK_MODULES inside an if can break later PKG_CHECK_MODULES
  relying on the AC_REQUIRE part being run. AS_IF ensures that
  requirements are run before the condition.

* Running a bare pkg-config again misses $ac_tool_prefix.

Helmut
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