compile error on CentOS 6 / gcc 4.4

[Dimitar Misev]

[C] Compiling third_party/boringssl/crypto/bio/connect.c
cc1: warnings being treated as errors
third_party/boringssl/crypto/bio/connect.c: In function Б─≤split_host_and_portБ─≥:
third_party/boringssl/crypto/bio/connect.c:127: error: declaration of Б─≤closeБ─≥ shadows a global declaration
/usr/include/unistd.h:350: error: shadowed declaration is here
make[3]: *** [/home/ssdm/rasdaman/third_party/grpc/objs/opt/third_party/boringssl/crypto/bio/connect.o] Error 1
make[3]: Leaving directory `/home/ssdm/rasdaman/third_party/grpc'
make[2]: *** [/home/ssdm/rasdaman/third_party/bin/grpc] Error 2
make[2]: Leaving directory `/home/ssdm/rasdaman/third_party'
make[1]: *** [install-recursive] Error 1
make[1]: Leaving directory `/home/ssdm/rasdaman'
make: *** [install] Error 2 

Here it's claimed to have been solved: ​https://github.com/grpc/grpc/issues/5370

[Alex Toader]

The latest commit in the version of GRPC we are using is:
commit b0c3366b9876b88bdd8bd16a9b5cced737eb74ff
Merge: 74ee71d be8cbdf
Author: Nathaniel Manista <nathaniel@…>
Date: Tue Feb 9 14:35:52 2016 -0800

Merge pull request #5167 from soltanmm/sixfix

Add six to requirements.txt.

We can try to upgrade to a newer version.

[Dimitar Misev]

Ok let's try it.