[patch] PR bootstrap/54453 (libstdc++ doesn't build)

[Steven Bosscher]

Hello,

r190783 breaks bootstrap on powerpc64-unknown-linux-gnu. The problem
is caused by a regexp that used to check for space|tab before the
patch but now only looks for tab. The attached patch fixes this
problem for me, but I'm not sure why (I haven't tried to look into the
details of the problem, I've simply reverted parts of the commit that
broke things for me).

Can a libstdc++ maintainer please have a look?

Ciao!
Steven
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