build: optionalize some clang resource headers #3491
Merged
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This makes the RISCV specific resource header
riscv_vector.h
optional.It also similarly treats some of the ARM NEON headers. The RISCV header
added 10 MB to the resource directory which was previously 10 MB. This
header is gratuitously large, and increases the size of the build for a
target which may not be enabled.