Merge pull request #266 from oscarbenjamin/flint_320rc2

Bump FLINT to 3.2.0-rc2

Author: oscarbenjamin

bin/build_variables.sh

@@ -21,4 +21,4 @@ MPIRVER=3.0.0 # MPIR build no longer works (not clear where to download from)
 # These are the actual dependencies used (at least by default):
 GMPVER=6.3.0
 MPFRVER=4.1.0
-FLINTVER='3.2.0-rc1'
+FLINTVER='3.2.0-rc2'