modp: remove unused gyp files.

BUG=chromium:953642
TEST=ebuild ~/trunk/src/third_party/chromiumos-overlay/dev-libs/modp_b64/modp_b64-9999.ebuild clean compile

Change-Id: I5e8b3cb688eda540ce707db6035fbf7494328827
Reviewed-on: https://chromium-review.googlesource.com/1585479
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Keigo Oka <oka@chromium.org>
Reviewed-by: Shuhei Takahashi <nya@chromium.org>
Reviewed-by: Keigo Oka <oka@chromium.org>
2 files changed