arm: Create proper .rdata sections for COFF

On COFF, the default read only data section is `.rdata`, not `.rodata`.
14 jobs for master in 5 minutes and 19 seconds (queued for 1 second)
Status Job ID Name Coverage
  Style
passed #248274
amd64 debian
style-check

00:00:20

 
  Build
passed #248275
amd64 debian
build-debian

00:00:33

passed #248280
debian aarch64
build-debian-aarch64

00:01:15

passed #248281
debian aarch64
build-debian-aarch64-clang-5

00:01:10

passed #248276
amd64 debian
build-debian-static

00:00:35

passed #248283
debian aarch64
build-debian-werror

00:00:32

passed #248277
amd64 debian
build-debian32

00:00:26

passed #248282
macos
build-macos

00:00:27

passed #248278
win32
build-win32

00:00:32

passed #248279
win64
build-win64

00:00:34

 
  Test
passed #248284
amd64 debian
test-debian

00:00:47

passed #248285
amd64 debian
test-debian-asan

00:02:04

passed #248286
amd64 debian
test-debian-msan

00:01:02

passed #248287
amd64 debian
test-debian-ubsan

00:01:22