start><issue_comment>Title: Make upb build with MSVC 2015+ using CMake
username_0: upb should be compatible with MSVC 2015 and later, as those versions
implement C99. This commit gets the CMake-based build working with MSVC
2015 and newer.

* UPB_INFINITY added to port_def.inc as MSVC doesn't like the
  (1.0 / 0.0) idiom. Instead, we use the C99 INFINITY value.
* Added MSVC definitions of _upb_snprintf, _upb_vsnprintf, and
  _upb_va_copy to port_def.inc.

This does not add CMake-based code gen, so it is not a full fix for
https://github.com/protocolbuffers/upb/issues/94

Fixes https://github.com/protocolbuffers/upb/issues/189

Tested by building with CMake against:

* MSVC 2019
* MSVC 2017
* MSVC 2015
* Clang 6.0.0 on Ubuntu 18.04
* GCC 7.4.0 on Ubuntu 18.04
<issue_comment>username_1: This looks good. Once you sign the CLA I can merge. Thanks!
<issue_comment>username_0: Give me a few days for some internal-to-Microsoft reviews regarding the CLA.
<issue_comment>username_0: I haven't forgotten about this. Progress is being made on the internal-to-Microsoft stuff, but we're not quite ready yet.
<issue_comment>username_0: I signed it!
<issue_comment>username_0: It looks like this is no longer needed, thanks to commits by @veblush. Closing this PR.Camping in a natural setting is a great way to experience a dynamic and ever-changing canvas. Moreover, the loosely planned schedule will give the much needed mental break. You can engage in various outdoor activities, explore and observe to make your camping fun and exhilarating. Before you set out for camping, ensure that you have all the necessary equipments with you. Some of the stuff that you require includes knapsack, a tent and cooking equipments. We usually tend to forget several things while going out for a vacation or camping. Hence, it is advisable to prepare a checklist of all the necessary things.
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