meson: remove SSE-and-friends build options
The meson build would previously enable various ISA extensions by default, based only on compiler support. This would cause GEGL to crash on machines that don't actually support these extensions. Since GEGL itself currently makes no direct use of these extensions -- the build options only affected compiler flags -- this is pointless: people who build GEGL can simply add the necessary compiler flags themselves, in particular, -march=native for local builds. This commit removes all the ISA-extension build options. We might want to tweak the default optimization options instead, similarly to the Autoconf build.
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