Fix a variety of reproducibility issues

Include:
- Not regenerated man pages.
- Automake tarball with bad time (and completely useless).
- Ordering of files within tarballs.
- Resetting timestamp various fixes.
- Older tars not properly overwriting files leading to many issues.
- Weird lack of reproducibility in libtool scripts paths to tools.
- and more

sysc/gcc-4.7.4/gcc-4.7.4.sh

@@ -4,7 +4,6 @@
 
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-checksum=3960567fc3f358d85b58a6441d3fb97442821a6d51847df72109eec547617b0b
 
 src_prepare() {
     default