Use C compiler for Clang C instead of C++ compiler

5 jobs for master in 17 minutes and 34 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #364573473
build:webpack

00:02:53

 
  Test
passed #364573474
build:release

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passed #364573476
test:1.39

00:03:51

passed #364573477
test:nightly

00:14:40

passed #364573475
test:stable

00:03:50