cmake: targets linked to skeleton are GUI aps (WinMain, /subsystem:WINDOWS) so need WIN32

tools/camera/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_executable(camera
+add_executable(camera WIN32
     main.cpp camexamp.cpp viewer.cpp
 )
 

tools/im2d/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_executable(im2d
+add_executable(im2d WIN32
     im2d.cpp linelist.cpp main.cpp polyline.cpp trifan.cpp trilist.cpp tristrip.cpp
 )
 

tools/im3d/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_executable(im3d
+add_executable(im3d WIN32
     im3d.cpp linelist.cpp main.cpp polyline.cpp trifan.cpp trilist.cpp tristrip.cpp
 )
 

tools/lights/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_executable(lights
+add_executable(lights WIN32
     main.cpp lights.cpp
 )
 

tools/playground/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_executable(playgound
+add_executable(playgound WIN32
     camera.cpp font.cpp main.cpp ras_test.cpp splines.cpp tl_tests.cpp
 )
 

tools/subrast/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_executable(subrast
+add_executable(subrast WIN32
     main.cpp subrast.cpp
 )