pkg/54967: devel/ocaml-batteries: bump to v2.11.0 to fix build errors

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>Number:         54967
>Category:       pkg
>Synopsis:       devel/ocaml-batteries: bump to v2.11.0 to fix build errors
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 16 01:55:01 +0000 2020
>Originator:     Dean Matzkov
>Release:        pkgsrc-2019Q4
>Organization:
>Environment:
>Description:
The current version of devel/ocaml-batteries in pkgsrc 2019Q4 and -current errors out as follows:

----SNIP----
+ ocamlfind ocamlc -c -g -bin-annot -safe-string -w -3 -package bigarray,num,str -package bytes -I src -I testsuite -I qtest -I build -I benchsuite -o src/batGc.cmi src/batGc.mli
File "src/batGc.mliv", line 101, characters 0-2836:
Error: This variant or record definition does not match that of type
         Gc.control
       The field custom_major_ratio is only present in the original definition.
-----/SNIP-----
>How-To-Repeat:

>Fix:
Bumping the version to v2.11.0 fixed the build for me.