Add constants for type-specific annotation form flags.

Remove duplicate copy in fpdfsdk/cpdfsdk_common.h. Fix the value for
RadiosInUnison flag.

BUG=pdfium:1049

Change-Id: I0a8c854383327cd4cca1055f61dfd0ca03356165
Reviewed-on: https://pdfium-review.googlesource.com/c/49693
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/fpdfsdk/pwl/BUILD.gn b/fpdfsdk/pwl/BUILD.gn
index d37fe69..ccf7e1f 100644
--- a/fpdfsdk/pwl/BUILD.gn
+++ b/fpdfsdk/pwl/BUILD.gn
@@ -42,6 +42,7 @@
   configs += [ "../../:pdfium_core_config" ]
   deps = [
     "../../:pdfium_public_headers",
+    "../../constants",
     "../../core/fpdfapi/font",
     "../../core/fpdfapi/page",
     "../../core/fpdfapi/parser",