ignore gcov output files

9 jobs for warnings in 3 minutes and 55 seconds
Status Job ID Name Coverage
  Test
passed clang-c++11 #76185
Linux

00:03:54

passed cppcheck #76187
Linux

00:00:29

passed doc #76192
Linux

00:00:16

passed gcc-c++11 #76184
Linux

00:02:11

passed macos-c++11 #76186
Apple

00:03:01

passed VS2015-32-bit #76191
VS2015

00:01:17

passed VS2015-64-bit #76190
VS2015

00:01:20

passed VS2017-32-bit #76189
VS2017

00:01:10

passed VS2017-64-bit #76188
VS2015

00:01:18