Resolve build errors caused by invalid dependencies

This commit corrects problems with dependencies in plugins and features,
which have been preventing successful build of plugin from CLI.

I don't understand how Eclipse build system works, however it manages to
build project from GUI, but then fails to do the same from CLI, even more it
doesn't bother with printing any error message, it just doesn't produce
output.

It also sets minimum required Java runtime to 1.6. It looks like our code
uses features that are >= Java 1.6, but in our manifest minimum required
version was 1.5.

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit 3963289271d0c19783f8a05ab64296fd18376808)

Conflicts:
	com.arc.embeddedcdt/META-INF/MANIFEST.MF
	org.eclipse.cdt.cross.arc.gnu.uclibc/META-INF/MANIFEST.MF
Rename debugger feature, add Elf32 plugin to it

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit 44dcab5e0d27ddb3445f9852c83cdfad434fc078)

Conflicts:
	feature/.project
Remove obsolete feature for Elf32 plugin

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit 5dccb32ebade7af8c212a71b853c320b1a18b228)

Conflicts:
	org.eclipse.cdt.cross.arc.gnu-feature/feature.xml
Add new update site project

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit eed10fe5009768169c42152d3e928013684e44a4)
Remove old update site projects

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit f5d4bef1dcf2b819251d756a0951bbe623c852c6)
Add build files to generate zip from CLI

Use ECLIPSE_WORKSPACE environment bar in Makefile, because WORKSPACE might
conflict with Jenkins variable.

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit 84ba5172f2a86b1ae778c16710ab3462364c3da7)
Copy site.xml when creating plugins zip

Signed-off-by: Anton Kolesov <anton.kolesov@synopsys.com>
(cherry picked from commit 72ed565c8c613806c5770a805765c27bb6c140ae)