libucl: vendor import snapshort 20210314(cherry picked from commit a0409676120c1e558d0ade943019934e0f15118d)
Update libucl to latest git snapshot (20151027)
Update libucl to git version 8d3b186
Update libucl to latest versionWhile here correctly link libucl to libm and register the dependency on libmfor static building
Readd Makefile.inc that were used to include upper level Makefile.inc andset (among other things) the destination where the binary should be installed