Make MinGW builds fully statically linked

Note the pthread usage is due to the Worker support, which is gated out
on Windows so there should be no need to link with pthreads on MinGW.

.github/workflows/ci.yml

@@ -250,6 +250,7 @@ jobs:
     - name: stats
       run: |
         make stats
+        ldd build/qjs
     - name: test
       run: |
         make test

CMakeLists.txt

@@ -132,9 +132,9 @@ if(BUILD_QJS_LIBC)
     list(APPEND qjs_sources quickjs-libc.c)
 endif()
 list(APPEND qjs_defines _GNU_SOURCE)
-list(APPEND qjs_libs qjs m pthread)
+list(APPEND qjs_libs qjs m)
 if(NOT MINGW)
-    list(APPEND qjs_libs dl)
+    list(APPEND qjs_libs dl pthread)
 endif()
 
 add_library(qjs ${qjs_sources})
@@ -180,7 +180,9 @@ set_target_properties(qjs_exe PROPERTIES
 )
 target_compile_definitions(qjs_exe PRIVATE ${qjs_defines})
 target_link_libraries(qjs_exe ${qjs_libs})
-if(NOT MINGW)
+if(MINGW)
+    target_link_options(qjs_exe PRIVATE -static -static-libgcc)
+else()
     set_target_properties(qjs_exe PROPERTIES ENABLE_EXPORTS TRUE)
 endif()