CMake: Link libgcc/libstdc++ statically

Fixes missing DLLs on Windows

CMakeLists.txt

@@ -152,7 +152,7 @@ target_link_libraries(clx2pixels PUBLIC common clx_decode)
 set_target_properties(clx2pixels PROPERTIES PUBLIC_HEADER "src/public/include/clx2pixels.hpp")
 target_include_directories(clx2pixels PRIVATE src/internal)
 
-foreach(_target cel2clx_main cl22clx_main pcx2clx_main)
+foreach(_target cel2clx_main cl22clx_main clx2pcx_main pcx2clx_main)
   if(ASAN)
     target_compile_options(${_target} PUBLIC -fsanitize=address -fsanitize-recover=address)
     target_link_libraries(${_target} PUBLIC -fsanitize=address -fsanitize-recover=address)
@@ -162,6 +162,10 @@ foreach(_target cel2clx_main cl22clx_main pcx2clx_main)
     target_compile_options(${_target} PUBLIC -fsanitize=undefined)
     target_link_libraries(${_target} PUBLIC -fsanitize=undefined)
   endif()
+
+  if(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
+    target_link_libraries(${_target} PUBLIC "-static-libgcc -static-libstdc++")
+  endif()
 endforeach()
 
 if(ENABLE_INSTALL)