Use our optimized require over a bare require.
Use our optimized require over a bare require.

Besides being faster (at least for environments with lots
of directories on the load path), this avoids potentially
loading the file twice, since rspec-mocks loads it in this
fashion rather than with a bare require.

Fixes rspec/rspec-support#244.
azbshiri/rspec-core,Teino1978-Corp/Teino1978-Corp-rspec-core,Teino1978-Corp/Teino1978-Corp-rspec-core,azbshiri/rspec-core,xmik/rspec-core,Teino1978-Corp/Teino1978-Corp-rspec-core,rspec/rspec-core,rspec/rspec-core,xmik/rspec-core,azbshiri/rspec-core,rspec/rspec-core,xmik/rspec-core