configure.ac: call `AC_USE_SYSTEM_EXTENSIONS` earlier
When bootstrapping, with autoconf 2.72, I see:
autoreconf: running: /usr/bin/autoconf
configure.ac:7: warning: AC_COMPILE_IFELSE was called before AC_USE_SYSTEM_EXTENSIONS
m4/ac_extensions.m4:38: AC_USE_SYSTEM_EXTENSIONS is expanded from...
configure.ac:7: the top level
Move the call to `AC_USE_SYSTEM_EXTENSIONS` earlier to avoid that.
Change-Id: I836889d9816708530ddbd7c66d8e2c331eadbead
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
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