Remove thin_archive config from complete static libraries

Following CL [1], it is required to remove the thin_archive config
everywhere complete_static_lib is set.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/954344

BUG=chromium:801925
R=thestig

Change-Id: Ia142aa65c375f0ab42346599d07167c38332c357
Reviewed-on: https://pdfium-review.googlesource.com/28890
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index 479971d..28d4a9c 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -230,6 +230,7 @@
 
   if (pdf_is_complete_lib) {
     complete_static_lib = true
+    configs -= [ "//build/config/compiler:thin_archive" ]
   }
 }