[patch] Fix SDL2 detection on some platforms

[Sijmen J. Mulder]

There's a small portability issue in configure.ac, which uses test(1) to
check the SDL version. On platforms where test does not support the '=='
syntax, SDL 1 is incorrectly assumed.

Example:

  $ uname -sr
  NetBSD 10.0_RC3
  $ test x = x || echo fail
  $ test x == x || echo fail
  $ sh -c 'test x = x' || echo fail
  $ sh -c 'test x == x' || echo fail
  test: ==: unexpected operator
  fail

Sijmen J. Mulder

--- configure.ac.orig   2024-02-04 22:00:47.864879289 +0000
+++ configure.ac
@@ -1219,7 +1219,7 @@ if test x$fim_handle_sdl != xno; then
                 LIBS="$LIBS `$LIBSDL_CONFIG $LIBSDL_CONFIG_FLAGS`"
                # finish this !
                 #FIM_LIB_OBJECTS="$FIM_LIB_OBJECTS SDLDevice.o"
-               if test x`$LIBSDL_CONFIG --version | head -c 1` == x2; then
+               if test x`$LIBSDL_CONFIG --version | head -c 1` = x2; then
                        AC_DEFINE(FIM_WITH_LIBSDL, 2, [Defined if libsdl 
support is enabled, and set to 1 or 2.])
                else
                        AC_DEFINE(FIM_WITH_LIBSDL, 1, [Defined if libsdl 
support is enabled, and set to 1 or 2.])

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