MPFR should be built in stage 2.
be a bit more permissive about allowed method name expressions.
fixes #2984
more MPFR special functions
Merge pull request #3012 from stevengj/bigfloat_funcs

RFC: more BigFloat special functions
define exp2 and exp10 for Complex
use try-finally in with_bigfloat_*
Merge pull request #3013 from stevengj/master

define exp2 and exp10 for Complex
Fixed bug in tests for poll_fd and file watcher
Merge pull request #3017 from amitmurthy/amitm

Fixed bug in tests for poll_fd and file watcher
more correct and reliable wine PATH implementation
add a wine_pathsearch Makefile function that improves generality of windows 64 cross-make dist target
fix #3010
typo fix MPRF -> MPFR