autobuild3: bump to v1.5.1

- A trivial fix on 51-licenses.sh regarding a syntax error in the
  binary expression f461747.
- Fixes filter/elf.sh with ELF search and detection.

autobuild/defines

@@ -22,7 +22,7 @@ timestamp_convert(){
 
 PKGNAME=autobuild3$( ((_GIT)) && echo "-git-$(git branch 2>/dev/null | grep '*' | sed 's/*\ //g')")
 PKGEPOCH=1
-PKGVER=1.5$( ((_GIT)) && echo "+$(timestamp_convert $(git log -1 --date=raw --pretty=format:%cd))")
+PKGVER=1.5.1$( ((_GIT)) && echo "+$(timestamp_convert $(git log -1 --date=raw --pretty=format:%cd))")
 PKGDES="Automatic package building tool."
 PKGRECOM="distcc ccache"
 PKGDEP="dpkg bash rpm apt coreutils autoconf automake autogen spdx-licenses"