meson: Fix empty options in celt armopts #455
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For example, if CPU does not support NEON, the armopts.s OPUS_ARM_MAY_HAVE_NEON should be set to 0. Without this fix, @OPUS_ARM_MAY_HAVE_NEON@ macro is replaced to "", which leads to failure during compilation when armopts-gnu.S is compiled by GCC.