licenses: drop CC-BY-NC

Nothing uses this, so remove them to avoid accidental future usage.

BUG=None
TEST=CQ passes

Change-Id: I0d78fb9dddef6eba6bc3eaef5c90a15a41f44ae8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2304267
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
diff --git a/licenses/CC-BY-NC-4.0 b/licenses/CC-BY-NC-4.0
deleted file mode 100644
index 1fe4148..0000000
--- a/licenses/CC-BY-NC-4.0
+++ /dev/null
@@ -1,407 +0,0 @@
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diff --git a/licenses/CC-BY-NC-ND-2.0 b/licenses/CC-BY-NC-ND-2.0
deleted file mode 100644
index 8632c2d..0000000
--- a/licenses/CC-BY-NC-ND-2.0
+++ /dev/null
@@ -1,228 +0,0 @@
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diff --git a/licenses/CC-BY-NC-ND-2.5 b/licenses/CC-BY-NC-ND-2.5
deleted file mode 100644
index 1108bab..0000000
--- a/licenses/CC-BY-NC-ND-2.5
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@@ -1,232 +0,0 @@
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diff --git a/licenses/CC-BY-NC-ND-3.0 b/licenses/CC-BY-NC-ND-3.0
deleted file mode 100644
index 9b026dc..0000000
--- a/licenses/CC-BY-NC-ND-3.0
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@@ -1,308 +0,0 @@
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-INCLUDING, WITHOUT LIMITATION, WARRANTIES OF TITLE, MERCHANTIBILITY,
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diff --git a/licenses/CC-BY-NC-SA-2.5 b/licenses/CC-BY-NC-SA-2.5
deleted file mode 100644
index a29029c..0000000
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diff --git a/licenses/CC-BY-NC-SA-3.0 b/licenses/CC-BY-NC-SA-3.0
deleted file mode 100644
index a632f3e..0000000
--- a/licenses/CC-BY-NC-SA-3.0
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diff --git a/licenses/CC-BY-NC-SA-4.0 b/licenses/CC-BY-NC-SA-4.0
deleted file mode 100644
index 718c647..0000000
--- a/licenses/CC-BY-NC-SA-4.0
+++ /dev/null
@@ -1,438 +0,0 @@
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