build-sys: make sure check-api-docs sees each symbol just once
Given that some symbols are exposed by multiple libraries (due to the compatibility libraries), let's ensure "make check-api-docs" only shows each symbol once by filtering out duplicates.
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@ -6322,7 +6322,7 @@ exported-%: %
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$(AM_V_GEN)$(NM) -g --defined-only $(builddir)/.libs/$(<:.la=.so) 2>&1 /dev/null | grep " T " | cut -d" " -f3 > $@
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exported: $(addprefix exported-, $(lib_LTLIBRARIES))
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$(AM_V_GEN)cat $^ > $@
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$(AM_V_GEN)sort -u $^ > $@
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.PHONY: check-api-docs
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check-api-docs: exported man
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