standard C library development files

 musl is lightweight, fast, simple, free and strives
 to be correct in the sense of standards-conformance
 and safety.
 .
 This package contains the static linked libraries
 and the include files.
 .
 This package also contains the specs file and gcc
 wrapper script for cross-compilation. For the native
 musl-gcc script, install the musl-tools package.