community/kealib: upgrade to 1.4.15

kealib-1.4.14...kealib-1.4.15

85732726 add support for ArcPro 2.7
0cdd1959 WIP: New implementation of kealib python bindings using libawkward ()
352342e3 add arc 10.9 and arc pro 2.8
40044c72 set the attribute chunksize as passed in, not zero ()
208a1d7b print error on open failure ()
027a1c44 Create an automatic build step
a47530f1 try sudo
74f7d49a cd into build dir each step
d9ef19fd add LD_LIBRARY_PATH
f1a7e728 .deb package building for ubuntugis 20.04 ()
bb5e0dbf add support for 64 bit images for GDAL versions that support it ()
081b2267 fix windows builds ()
c22835c8 add support for 64bit nodata functions ()
3403ce4e get ready for version 1.4.15 ()