Build is broken since commit 8a44c55d2fb758f726b8b436aa5c0b88a6c6f112 because `_gcry_sha512_transform_armv7_neon` is undefined when `!USE_ARM_NEON_ASM` but it is used as soon as `USE_ARM_ASM` is defined resulting in the following build failure:
```
/bin/bash ../libtool --tag=CC --mode=link /home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -fvisibility=hidden -fno-delete-null-pointer-checks -Wall -o mpicalc mpicalc-mpicalc.o libgcrypt.la -lgpg-error
libtool: link: /home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -fvisibility=hidden -fno-delete-null-pointer-checks -Wall -o mpicalc mpicalc-mpicalc.o ./.libs/libgcrypt.so -lgpg-error -Wl,-rpath -Wl,/home/giuliobenetti/autobuild/run/instance-0/output-1/build/libgcrypt-1.9.0/src/.libs
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/8.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: ./.libs/libgcrypt.so: undefined reference to `_gcry_sha512_transform_armv7_neon'
```
To fix this build failure, `USE_ARM_ASM` could be replaced by `USE_ARM_NEON_ASM`.
Full build log:
- http://autobuild.buildroot.org/results/341e720e9e3fcdaaa7e30f02fe2c26d145653240/build-end.log