[2.7] bpo-29766: Do not force --with-lto to true for --enable-optimizations

[hannosch]

This fixes a faulty backport to the Python 2.7 branch only of https://bugs.python.org/issue28032. Details in the https://bugs.python.org/issue29766.

Pinging @gpshead as it was his change ;)

[the-knights-who-say-ni]

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[gpshead]

Agreed, this was an omission on my part when making the modification to 2.7. thanks!