disable as-needed by default?

[Björn JACKE]

Hi,

today I added a configure test to master which catches the case of buggy ld
version which make the use of the as-needed linker flag error-prone on some
systems. Volker and maybe others have objections to keep using the flag even
with the configure test in place. Attached is the patch to disable it by
default. Are there objections to change the default to not use it?

Cheers
Björn
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