meson: Drop host_arch rename for riscv64

This requires renaming several directories:
tcg/riscv, linux-user/include/host/riscv, and
common-user/host/riscv.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

MAINTAINERS

@@ -4086,7 +4086,7 @@ M: Palmer Dabbelt <palmer@dabbelt.com>
 M: Alistair Francis <Alistair.Francis@wdc.com>
 L: qemu-riscv@nongnu.org
 S: Maintained
-F: tcg/riscv/
+F: tcg/riscv64/
 F: disas/riscv.[ch]
 
 S390 TCG target

configure

@@ -469,8 +469,8 @@ case "$cpu" in
     CPU_CFLAGS="-m64 -mlittle-endian"
     ;;
 
-  riscv32 | riscv64)
-    host_arch=riscv
+  riscv64)
+    host_arch=riscv64
     linux_arch=riscv
     ;;
 

meson.build

@@ -265,8 +265,6 @@ enable_modules = get_option('modules') \
 
 if cpu not in supported_cpus
   host_arch = 'unknown'
-elif cpu in ['riscv32', 'riscv64']
-  host_arch = 'riscv'
 else
   host_arch = cpu
 endif