Needed because libtomcrypt expects this symbol to be available
https://github.com/libtom/tomsfastmath/commit/81530c207da8b3a43867da14df7d79d2cdf96978.patch
--- a/libtfm.symbols+++ b/libtfm.symbols@@ -16,6 +16,7 @@ fp_gcdfp_ident
fp_invmod
fp_isprime
+fp_isprime_exfp_lcm
fp_lshd
fp_mod