Merge branch 'patch-1' into 'master'

Fix m4 recipe for boost::context to work with boost >=1.68

See merge request !15
6 jobs for master
Status Job ID Name Coverage
  Test
canceled #3888
amd64
job_clang_amd64

canceled #3892
amd64
job_clang_amd64_nosh

canceled #3890
amd64
job_clang_py2_amd64

canceled #3887
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job_gcc_amd64

canceled #3891
amd64
job_gcc_amd64_nosh

canceled #3889
amd64
job_gcc_py2_amd64