do not duplicate external dependencies in list #5073
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Since the "-l<lib>" flags in the build.ninja file are passed in "--start-group"/"--end-group" flags, there should be no need to have any library listed twice, even if there are circular dependencies. Therefore we can eliminate duplicates. For speed, rather than deduplicating at the end of the process, it's faster to not add the duplicate flags in the first place. This should help fix mesonbuild#2150
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Since the "-l" flags in the build.ninja file are passed in
"--start-group"/"--end-group" flags, there should be no need to have any
library listed twice, even if there are circular dependencies. Therefore we
can eliminate duplicates. For speed, rather than deduplicating at the end
of the process, it's faster to not add the duplicate flags in the first
place.
This should help fix #2150