Only build acvp/modulewrapper with BUILD_TESTING

[justsmth]

Issues:

N/A

Description of changes:

• Previously when building for FIPS with both -DBUILD_LIBSSL=OFF and -DBUILD_TESTING=OFF, CMake produces an error, and the subsequent build attempt fails.

> cmake "-DFIPS=1" "-DBUILD_LIBSSL=OFF" "-DBUILD_TESTING=OFF" ../aws-lc
...
-- Configuring done
CMake Error: Cannot determine link language for target "modulewrapper".
CMake Error: CMake can not determine linker language for target: modulewrapper
-- Generating done
-- Build files have been written to: /home/justsmth/repos/AWS-LC-BUILD

• Added a build using these flags to the CI.

Call-outs:

N/A

Testing:

Successfully built using these flags:

> cmake "-DFIPS=1" "-DBUILD_LIBSSL=OFF" "-DBUILD_TESTING=OFF" ../aws-lc
-- Found Threads: TRUE  
-- Configuring done
-- Generating done
-- Build files have been written to: /home/justsmth/repos/AWS-LC-BUILD

> make
...
[ 99%] Built target crypto_objects
Scanning dependencies of target fipsmodule
[ 99%] Building C object crypto/fipsmodule/CMakeFiles/fipsmodule.dir/fips_shared_support.c.o
[100%] Building C object crypto/fipsmodule/CMakeFiles/fipsmodule.dir/cpucap/cpucap.c.o
[100%] Built target fipsmodule
Scanning dependencies of target crypto
[100%] Linking C static library libcrypto.a
[100%] Built target crypto

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[torben-hansen]

nice