build: Fix ARM ISA detection
armv7 isn't a real cpu_family in meson, so drop that. The detection for __ARM_ARCH_ISA_ARM was also inverted.
Fixes: #6 (closed)
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armv7 isn't a real cpu_family in meson, so drop that. The detection for __ARM_ARCH_ISA_ARM was also inverted.
Fixes: #6 (closed)