Fix run-compiler for old /bin/sh #11228
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If you try to assign and export on the same line on some older /bin/sh implementations, it complains:
Also, as written, the name and value are quoted together. This also makes old /bin/sh sad:
This commit rewrites run-compiler's assignments and exports to work with old /bin/sh, splitting assignment and export into two separate statements, and only quote the value. So now we have:
While we're here, make the same change to the two supporting assign+export lines preceeding the script to be consistent with how exports work throughout the rest of configure.ac.