Support mingw/wasm

[star-hengxing]

Just need a small patch.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 413b4579..f9f1371d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,14 +42,14 @@ else()
 	set(LSQPACK_DEPENDS "libxxhash")
 endif()
 
-if(WIN32)
+if(MSVC OR MINGW OR EMSCRIPTEN)
     target_include_directories(ls-qpack PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/wincompat>
         $<INSTALL_INTERFACE:include>
     )
 endif()
 
-if(WIN32)
+if(MSVC)
     target_compile_options(ls-qpack PRIVATE
         /Wall
         /wd4100 # unreffed parameter
@@ -144,7 +144,7 @@ if(LSQPACK_BIN)
           DESTINATION ${CMAKE_INSTALL_BINDIR})
 endif()
 
-if(WIN32)
+if(MSVC OR MINGW OR EMSCRIPTEN)
     install(DIRECTORY wincompat/sys DESTINATION include)
 else()
     install(FILES "${CMAKE_CURRENT_BINARY_DIR}/lsqpack.pc"