Variety of improvements

- Rename sources to distfiles for clarity.
- Per sys(a/c) distfiles to reduce rootfs.py processing and reduce RAM
  usage in sysa.
- Canonicalise early kaem mes/tcc files to kaem script conventions.
- Cleanup unused setup in python.

sysa/mes/mes.kaem

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # SPDX-FileCopyrightText: 2020-2021 Andrius Štikonas <andrius@stikonas.eu>
-# SPDX-FileCopyrightText: 2020-2021 fosslinux <fosslinux@aussies.space>
+# SPDX-FileCopyrightText: 2020-2022 fosslinux <fosslinux@aussies.space>
 #
 # SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -18,14 +18,17 @@ cp files/mescc.scm ${bindir}/
 chmod 755 ${bindir}/mescc.scm
 
 # Unpack
-mkdir src
-cp ${sources}/${NYACC_PKG}.tar.gz src/
-cp ${sources}/${MES_PKG}.tar.gz src/
+mkdir src build
 cd src
+cp ${distfiles}/${NYACC_PKG}.tar.gz ${NYACC_PKG}.tar.gz
 ungz ${NYACC_PKG}.tar.gz
-untar ${NYACC_PKG}.tar
+cp ${distfiles}/${MES_PKG}.tar.gz ${MES_PKG}.tar.gz
 ungz ${MES_PKG}.tar.gz
-untar ${MES_PKG}.tar
+cd ..
+
+cd build
+untar ../src/${NYACC_PKG}.tar
+untar ../src/${MES_PKG}.tar
 
 cp ../files/config.h ${MES_PREFIX}/include/mes
 
@@ -287,5 +290,5 @@ cp include/sys/user.h ${incdir}/sys/user.h
 cp include/sys/wait.h ${incdir}/sys/wait.h
 
 # Checksums
-cd ${sysa}/${MES_PKG}
+cd ../..
 sha256sum -c checksums