CFI-icall: Blacklist dynamically resolved cross-DSO call in symupload

BUG=838858

Change-Id: Ibbdf3500626a11b7c73c179f582aaee3f452498f
Reviewed-on: https://chromium-review.googlesource.com/1043259Reviewed-by: Peter Collingbourne <pcc@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555915}

tools/cfi/blacklist.txt

@@ -181,6 +181,9 @@ fun:*GlobalMenuBarX11*
 # third_party/skia/include/gpu/gl/GrGLFunctions.h
 fun:*GrGLFunction*
 
+# Call to libcurl.so from the symupload utility
+src:*third_party/breakpad/breakpad/src/common/linux/http_upload.cc
+
 ######### Function pointers cast to incorrect type signatures
 
 # libicu is currently compiled such that in libicu the 'UChar' type is a