Bug#1030815: keyman: Missing autopkgtest dependency on pkg-config

[Adrian Bunk <bunk@debian.org>]

Source: keyman
Version: 16.0.138-1
Severity: serious

https://ci.debian.net/data/autopkgtest/testing/amd64/k/keyman/31022569/log.gz

...
autopkgtest [03:17:05]: test test-build: [-----------------------
/tmp/autopkgtest-lxc.1u3zjijx/downtmp/build.9GP/src/debian/tests/test-build: line 18: pkg-config: command not found
In file included from /usr/include/keyman/keyboardprocessor.h:103,
                 from keymantest.c:1:
/usr/include/keyman/keyboardprocessor_bits.h:69:10: fatal error: km_types.h: No such file or directory
   69 | #include <km_types.h>
      |          ^~~~~~~~~~~~
compilation terminated.
autopkgtest [03:17:05]: test test-build: -----------------------]
autopkgtest [03:17:05]: test test-build:  - - - - - - - - - - results - - - - - - - - - -
...