Bug#894069: libgtk-3-dv: AM_PATH_GTK_3_0 misuses AC_PATH_PROG

[Helmut Grohne]

Package: libgtk-3-dev
Version: 3.22.29-2
Tags: patch upstream
User: helmutg at debian.org
Usertags: rebootstrap
Control: affects -1 + src:terminatorx

AM_PATH_GTK_3_0 uses AC_PATH_PROG for finding pkg-config. Unfortunately,
that will find the build architecture pkg-config which in turn will miss
the host architecture gtk+3.0. What must be used here is the host
architecture pkg-config and that is found with AC_PATH_TOOL. Please
consider applying the attached patch.

If AM_PATH_GTK_3_0 was using PKG_PROG_PKG_CONFIG or even
PKG_CHECK_MODULES, this problem would have gone away entirely. Is there
a reason for not using these macros?

Helmut
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