build.py: improve BuildTarget error message

Improve the error message when a build target is assigned as dependency
of another build target, which allows to better pinpoint where the issue
lies on.

In the example that follow, modules/meson.build:294 is in a for loop
creating library targets from an array of dictionary, and doesn't point
to the location where interop_sw_plugin is assigned with vlc_opengl:

Before:

    modules/meson.build:294:17: ERROR: Tried to use a build target as a dependency.
    You probably should put it in link_with instead.

After:

    modules/meson.build:294:17: ERROR: Tried to use a build target vlc_opengl as a dependency of target interop_sw_plugin.
    You probably should put it in link_with instead.

It would probably be best to directly pinpoint where the assignment was
made but it's probably harder so start simple by saying what is
concerned by the error.

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