cmake: assume autotools static libraries with lib prefix and .a suffix

sdl2-config.cmake.in

@@ -65,7 +65,7 @@ if(_sdl2_libraries MATCHES ".*SDL2main.*")
   list(INSERT SDL2_STATIC_LIBRARIES 0 SDL2::SDL2main)
 endif()
 
-set(_sdl2main_library ${SDL2_LIBDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}SDL2main${CMAKE_STATIC_LIBRARY_SUFFIX})
+set(_sdl2main_library ${SDL2_LIBDIR}/libSDL2main.a)
 if(EXISTS "${_sdl2main_library}")
   set(SDL2MAIN_LIBRARY SDL2::SDL2main)
   if(NOT TARGET SDL2::SDL2main)
@@ -104,8 +104,8 @@ set(_sdl2_link_libraries ${_sdl2_libraries})
 list(REMOVE_ITEM _sdl2_link_libraries SDL2 SDL2main mingw32 cygwin)
 
 if(WIN32)
-  set(_sdl2_implib "${SDL2_LIBDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}SDL2${CMAKE_SHARED_LIBRARY_SUFFIX}${CMAKE_STATIC_LIBRARY_SUFFIX}")
-  set(_sdl2_dll "${SDL2_BINDIR}/SDL2${CMAKE_SHARED_LIBRARY_SUFFIX}")
+  set(_sdl2_implib "${SDL2_LIBDIR}/libSDL2.dll.a")
+  set(_sdl2_dll "${SDL2_BINDIR}/SDL2.dll")
   if(EXISTS "${_sdl2_implib}" AND EXISTS "${_sdl2_dll}")
     if(NOT TARGET SDL2::SDL2)
       add_library(SDL2::SDL2 SHARED IMPORTED)
@@ -125,7 +125,7 @@ if(WIN32)
   unset(_sdl2_implib)
   unset(_sdl2_dll)
 else()
-  set(_sdl2_shared "${SDL2_LIBDIR}/${CMAKE_SHARED_LIBRARY_PREFIX}SDL2${CMAKE_SHARED_LIBRARY_SUFFIX}")
+  set(_sdl2_shared "${SDL2_LIBDIR}/libSDL2${CMAKE_SHARED_LIBRARY_SUFFIX}")
   if(EXISTS "${_sdl2_shared}")
     if(NOT TARGET SDL2::SDL2)
       add_library(SDL2::SDL2 SHARED IMPORTED)
@@ -144,7 +144,7 @@ else()
   unset(_sdl2_shared)
 endif()
 
-set(_sdl2_static "${SDL2_LIBDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}SDL2${CMAKE_STATIC_LIBRARY_SUFFIX}")
+set(_sdl2_static "${SDL2_LIBDIR}/libSDL2.a")
 if(EXISTS "${_sdl2_static}")
   if(NOT TARGET SDL2::SDL2-static)
     add_library(SDL2::SDL2-static STATIC IMPORTED)
@@ -165,7 +165,7 @@ unset(_sdl2_static)
 
 unset(_sdl2_link_libraries)
 
-set(_sdl2test_library "${SDL2_LIBDIR}/${CMAKE_STATIC_LIBRARY_PREFIX}SDL2_test${CMAKE_STATIC_LIBRARY_SUFFIX}")
+set(_sdl2test_library "${SDL2_LIBDIR}/libSDL2_test.a")
 if(EXISTS "${_sdl2test_library}")
   if(NOT TARGET SDL2::SDL2test)
     add_library(SDL2::SDL2test STATIC IMPORTED)