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config: bump SDL2 library requirements

We are going to replace calls to the deprecated Mix_OpenAudio() API
with Mix_OpenAudioDevice() which has been added to SDL2_Mixer 2.0.2,
which in turn depends on SDL 2.0.7.

Both library versions have been released in Oct 2017.

--- a/CMakeLists.txt

+++ b/CMakeLists.txt

@@ -28,8 +28,8 @@

                         "-Wredundant-decls")

 endif()

-find_package(SDL2 2.0.1)

-find_package(SDL2_mixer 2.0.0)

+find_package(SDL2 2.0.7)

+find_package(SDL2_mixer 2.0.2)

 find_package(SDL2_net 2.0.0)

 # Check for libsamplerate.

--- a/configure.ac

+++ b/configure.ac

@@ -31,8 +31,8 @@

         CFLAGS="-O$OPT_LEVEL -g $WARNINGS $orig_CFLAGS"

 fi

-PKG_CHECK_MODULES(SDL, [sdl2 >= 2.0.1])

-PKG_CHECK_MODULES(SDLMIXER, [SDL2_mixer >= 2.0.0])

+PKG_CHECK_MODULES(SDL, [sdl2 >= 2.0.7])

+PKG_CHECK_MODULES(SDLMIXER, [SDL2_mixer >= 2.0.2])

 PKG_CHECK_MODULES(SDLNET, [SDL2_net >= 2.0.0])

 # Check for bash-completion.