Merge "riscv64: stop explicitly disabling emutls." into main

	riscv64Cflags = []string{

		// Help catch common 32/64-bit errors.

		"-Werror=implicit-function-declaration",

		"-fno-emulated-tls",

		"-march=rv64gcv_zba_zbb_zbs",

		// Equivalent to "-munaligned-access", but our clang doesn't have that yet.

		"-Xclang -target-feature -Xclang +unaligned-scalar-mem",

	riscv64Lldflags = append(riscv64Ldflags,

		"-Wl,-z,max-page-size=4096",

		"-Wl,-plugin-opt,-emulated-tls=0",

	)

	riscv64Cppflags = []string{}