Issue with Release folder creation on Windows environment.

[Dhruva21]

I built the spdm-emu code on windows environment. Used cmake to select the target as Debug or Release.
Steps followed for the build process:

1. mkdir build
2. cd build
3. cmake -DARCH=x64 -DTOOLCHAIN=CLANG -DTARGET=<Debug|Release> -DCRYPTO=mbedtls ..
4. msbuild spdm_emu.sln (added visual studio path to environment variable)

In step no.3, when I selected target as Debug mode, Debug folder is created and all the executables are generated successfully. But I found the issue when the target is selected as Release. Even though the target is Release, Debug folder is generated.

For temporary workaround, I made modifications in the top level cmake file. I removed debug libraries that are set.

[jyao1]

@Dhruva21 , could you help do some analysis and fix the issue?

I just use command line and does not use sln. Not sure what is the problem.

[Dhruva21]

@jyao1, after some analysis and study I figured out in the step 4 of the build process I was following, by default msbuild.exe generates the debug folder. So I had to additionally pass the property flag inorder to generate Release folder.
4. for debug folder: msbuild spdm_emu.sln
4. for release folder: msbuild spdm_emu.sln /property:Configuration=Release
Anyhow, I observed the debug libraries is included irrespective of the build type.

So I modified the cmake_c_standard_libraries based on cmake_build_type.

Can you review this change?