Roll third_party/libjpeg_turbo/ 518d81558..7b4981b65 (4 commits)

https://chromium.googlesource.com/chromium/deps/libjpeg_turbo.git/+log/518d81558c79..7b4981b6500c

Created with:
  roll-dep third_party/libjpeg_turbo

Change-Id: I2d777d57962204647cec09ffbb6b1f8f25e5502f
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/78531
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Hui Yingst <nigi@chromium.org>
diff --git a/DEPS b/DEPS
index 9d6733f..bd550ec 100644
--- a/DEPS
+++ b/DEPS
@@ -77,7 +77,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling jpeg_turbo
   # and whatever else without interference from each other.
-  'jpeg_turbo_revision': '518d81558c797486e125e37cb529d65b560a6ea0',
+  'jpeg_turbo_revision': '7b4981b6500ccba10733c352b9ed2dad14ce3c73',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling markupsafe
   # and whatever else without interference from each other.