Statically link the C runtime on Windows (#106)

CMakeLists.txt

@@ -29,6 +29,7 @@ option(QUIC_BUILD_TOOLS "Builds the tools code" ON)
 option(QUIC_BUILD_TEST "Builds the test code" ON)
 option(QUIC_ENABLE_LOGGING "Enables logging" ON)
 option(QUIC_SANITIZE_ADDRESS "Enables address sanitizer" OFF)
+option(QUIC_STATIC_LINK_CRT "Statically links the C runtime" ON)
 
 if ("${CMAKE_HOST_SYSTEM_NAME}" STREQUAL "Windows")
     set(QUIC_PLATFORM "windows")
@@ -88,6 +89,10 @@ if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
     set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} /Zi")
     set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi")
     set(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /DEBUG /OPT:REF /OPT:ICF")
+    if(QUIC_STATIC_LINK_CRT)
+        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+    endif()
+
 else()
     # Custom build flags.
     set(QUIC_COMMON_FLAGS "-DQUIC_PLATFORM_LINUX -fms-extensions -fPIC -Wall -Wno-unknown-pragmas -Wno-unused-variable -Wno-unused-value -pthread")