Warning in build.properties will be errors when they run
in the tycho build, like this:
```
Error: Failed to execute goal org.eclipse.tycho:tycho-packaging-plugin:2.7.5:package-plugin
(default-package-plugin) on project org.eclipse.cdt.core.tests:
/home/runner/work/cdt/cdt/core/org.eclipse.cdt.core.tests/build.properties:
bin.includes value(s) [test.xml] do not match any files. -> [Help 1]
```
So make them errors in the workspace so that the issue is
detected before push.
Some build.properties issues don't affect the build, but
are still indicative of a problem.
- modify ProcessFactory to prefix commands with flatpak-spawn
when running under Eclipse flatpak
- add new FlatpakLaunch class to dsf.gdb to do a prelaunch
of gdbserver and set up remote port settings when debugging
local C/C++ application under Eclipse flatpak
- add new tab to gdb when running under Eclipse flatpak
to allow user to specify gdbserver and port number
- add new org.eclipse.cdt.flatpak.launcher plug-in which
contains a FlatpakCommandLauncherFactory to handle copying
header files from host to workspace when developing under
Eclipse flatpak
- add new FlatpakCommandLauncher class which simply extends
CommandLauncher and can be used for debugging purposes to
distinguish from regular command launcher
- also add new FlatpakHeaderPreferencePage to allow C/C++ users
to delete copied headers if needed
- dynamically add the headers preference page from
FlatpakCommandLaunchFactory
if running under Eclipse flatpak
- add new ICommandLaunchFactory3 to add an interface to check if
headers have been modified/removed and scanner info refresh
is required
- add new org.eclipse.cdt.flatpak.launcher-feature
- give higher priority to ContainerCommandLauncherFactory so if
running on Eclipse flatpak, the flatpak factory won't be chosen
if both apply (i.e. building in a container but running on
Eclipse flatpak)
Change-Id: Id68e60c4dd37c4494af10440231ac7b7bbec8d17
