CPU feature checking - require neon

 The packages in the isa-support family probe for microprocessor Instruction
 Set Architecture features such as SSE3. By refusing to install on machines
 lacking a required feature, they allow ISA requirements to be handled in
 terms of package dependencies.
 .
 This is a mostly dummy package which checks for neon and refuses to install
 on unsupported hardware.
 .
 This is a mostly dummy package which checks for Neon and refuses to install
 on unsupported hardware.
 .
 Neon, also known as MPE (Media Processing Engine) or Advanced SIMD, is a
 combined 64- and 128-bit SIMD instruction set that provides standardised
 acceleration for media and signal processing applications. It is available
 on the vast majority of armhf devices but not guaranteed before the 64-bit
 capable ARMv8.