tools: fix linking error.
Though no error was raised during a native build, a cross-build was choking on this missing link to libgimpbase and failing. The error returned by the linker though was a bit amiss. Fixes: > gimp-test-clipboard.o: In function `test_clipboard_copy_callback': > tools/gimp-test-clipboard.c:419: undefined reference to `g_file_get_contents' > collect2: error: ld returned 1 exit status
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