Various fix for MSVC build

meson: Make meson compiler option for setting c++11 to fix MSVC build

MSVC cannot understand "-std=c++11"

build: include winsock2.h header before windows.h everywhere

build: Fix MSVC build error around std::max and std::min

min and max macros were defined in windef.h

build: Fix undefined M_PI error with MSVC

build: Fix MSVC build error C2712

../webrtc/base/platform_thread.cc(60): error C2712:
  Cannot use __try in functions that require object unwinding

Fixes: #2 (closed)