fxlink: find SDL2 without -mwindows to stay in console [Windows]

When loading SDL2 with pkg-config the -mwindows flag is added, which
instructs the loader to load the program through WinMain() and not
create a console for it. This is intended for GUI programs. However,
fxlink is a CLI program with just occasionally an SDL window on top of
it. Disable -mwindows to keep the console and terminal output. I don't
know how to do that with the pkg-config CMake module, so use the SDL2
module for the Windows build instead.

CMakeLists.txt

@@ -13,7 +13,14 @@ if(NOT FXLINK_DISABLE_UDISKS2)
   pkg_check_modules(udisks2 REQUIRED udisks2 IMPORTED_TARGET)
 endif()
 if(NOT FXLINK_DISABLE_SDL2)
-  pkg_check_modules(sdl2 REQUIRED sdl2 IMPORTED_TARGET)
+  if(WIN32)
+    set(SDL2_NO_MWINDOWS 1)
+    find_package(SDL2 REQUIRED)
+  else()
+    pkg_check_modules(sdl2 REQUIRED sdl2 IMPORTED_TARGET)
+    set(SDL2_LIBRARIES PkgConfig::sdl2)
+    set(SDL2_INCLUDE_DIRS)
+  endif()
 endif()
 pkg_check_modules(ncurses REQUIRED ncursesw IMPORTED_TARGET)
 
@@ -87,7 +94,8 @@ if(NOT FXLINK_DISABLE_UDISKS2)
   target_link_libraries(fxlink PkgConfig::udisks2)
 endif()
 if(NOT FXLINK_DISABLE_SDL2)
-  target_link_libraries(fxlink PkgConfig::sdl2)
+  target_link_libraries(fxlink ${SDL2_LIBRARIES})
+  target_include_directories(fxlink PRIVATE ${SDL2_INCLUDE_DIRS})
 endif()
 
 # fxsdk-gdb-bridge

fxlink/main.c

@@ -16,6 +16,11 @@
 #include <errno.h>
 #include <locale.h>
 
+#ifndef FXLINK_DISABLE_SDL2
+/* Grab main()-related macros */
+#include <SDL2/SDL.h>
+#endif
+
 static const char *help_string =
 "usage: %1$s (-l|-b|-t) [General options]\n"
 "       %1$s -i [-r] [--fxlink-log[=<FILE>]] [General options]\n"