[protobuf] Update to 3.12.3#11851

Merged

ras0219-msft merged 9 commits intomicrosoft:masterfrom

JonLiu1993:fixprotobuf

Jul 7, 2020

Commits on Jun 9, 2020

[protobuf] Update to 3.12.3
JonLiu1993
committed

Commits on Jun 10, 2020

fixCmakeLists.txt
JonLiu1993
committed

Commits on Jun 11, 2020

fixportfile.cmake
JonLiu1993
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Commits on Jun 23, 2020

Merge branch 'master' of https://github.com/Microsoft/vcpkg into fixprotobuf
JonLiu1993
committed

Commits on Jun 24, 2020

fixprotobufbuild
JonLiu1993
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