build: Improve libassuan.m4.
* src/libassuan.m4: Don't try gpgrt-config when LIBASSUAN_CONFIG set. Fall back to detecting libassuan-config, when gpgrt-config doesn't work well.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
build: Improve libassuan.m4. Tags None Subscribers None
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