Revert "libsdl2: disable SDL's own ccache"

The reverted patch's purpose is to avoid libsdl2-native from
detecting ccache from host. Now that we have made cmake.bbclass
to not search the host paths, the original patch is no longer
needed.

This reverts commit 01472f512f.

(From OE-Core rev: b614147df47138d95da17800e39af923e15671ad)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/libsdl2/libsdl2_2.26.5.bb

@@ -47,7 +47,6 @@ EXTRA_OECMAKE = "-DSDL_OSS=OFF -DSDL_ESD=OFF -DSDL_ARTS=OFF \
                  -DSDL_X11_XRANDR=OFF \
                  -DSDL_X11_XSCRNSAVER=OFF \
                  -DSDL_X11_XSHAPE=OFF \
-                 -DSDL_CCACHE=OFF \
 "
 
 # opengl packageconfig factored out to make it easy for distros