Fix libmng compilation on fast computers with fast SSDs (bug #47712). * src/libmng.mk: Run autoreconf in its own process, followed by configure. Delay between processes guarantees that the first is done before the next starts. Disable parallel make (make -j 1).

# This file is part of MXE.
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TARGET   = test-qt
QT += network sql
SOURCES += qt-test.cpp
FORMS   += qt-test.ui