api: include prefix in the C API

The API symbols are exported with the Wels prefix
Fix line endings in manifest files

Fixes build error in Android getting TOOLCHAINPREFIX
in build/platform-android.mk:

$NDKROOT/build/gmsl/__gmsl:512: *** non-numeric second argument to `wordlist' function: ''.  Stop.
Rename cpufeatures symbols to avoid colisions in static builds