use stb_image.h instead of SDL2_image

CMakeLists.txt

@@ -4,7 +4,6 @@ project(townengine LANGUAGES C)
 
 # SDL dependencies
 find_package(SDL2 REQUIRED GLOBAL)
-find_package(SDL2_image REQUIRED GLOBAL)
 
 # CMake actually has no default configuration and it's toolchain file dependent, set debug if not specified
 if(NOT CMAKE_BUILD_TYPE)
@@ -164,6 +163,7 @@ function(give_options target)
                 -Wconversion -Wno-sign-conversion
                 -Werror=vla
                 -Wno-missing-field-initializers
+                -Wunused-result
                 $<$<STREQUAL:${CMAKE_C_COMPILER_ID},Gnu>:-Wcast-align=strict>)
 
         target_compile_options(${target} PRIVATE
@@ -194,7 +194,6 @@ endfunction()
 function(link_deps target)
         target_link_libraries(${target} PUBLIC
                                         SDL2::SDL2
-                                        SDL2_image::SDL2_image
                                         physfs-static
                                         xms)
 endfunction()