Start using in-process WebRTC plotter

Now that we can link things a bit more sanely, we may as well start
using it and gradually remove dependencies on matplotlibcpp.

Change-Id: I344df7ca0dd70d615d5d63f9a3c9217d73dbd7de
diff --git a/frc971/analysis/BUILD b/frc971/analysis/BUILD
index 5a185eb..f56c429 100644
--- a/frc971/analysis/BUILD
+++ b/frc971/analysis/BUILD
@@ -172,8 +172,9 @@
     name = "in_process_plotter",
     srcs = ["in_process_plotter.cc"],
     hdrs = ["in_process_plotter.h"],
-    copts = [
-        "-DWEBRTC_POSIX",
+    data = [
+        ":plotter",
+        ":plotter_files",
     ],
     deps = [
         ":plot_data_fbs",
@@ -185,16 +186,6 @@
 cc_binary(
     name = "in_process_plotter_demo",
     srcs = ["in_process_plotter_demo.cc"],
-    copts = [
-        "-DWEBRTC_POSIX",
-    ],
-    data = [
-        ":plotter",
-        ":plotter_files",
-    ],
-    # Tagged manual until we either get the linker working with the current
-    # WebRTC implementation or we get a new implementation.
-    tags = ["manual"],
     deps = [
         ":in_process_plotter",
         "//aos:init",