Description of problem:
rh-mongodb36-libbson-devel isn't shipped but should be, it appears to be required to link against libmongoc.

Version-Release number of selected component (if applicable):
rh-mongodb36-libbson-devel-1.9.2-1.el7

How reproducible:
always

Steps to Reproduce:
1. yum install rh-mongodb36-mongo-c-driver-devel
2. gcc -c -xc /dev/null -om.o $(scl enable rh-mongodb36 - pkg-config --cflags libmongoc-1.0) 

Actual results:
Package libbson-1.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `libbson-1.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libbson-1.0', required by 'libmongoc', not found

Expected results:
success

Additional info:
Main bug here is that we don't ship rh-mongodb36-libbson-devel.

Also noted that rh-mongodb34-mongo-c-driver-devel doesn't Require: rh-mongodb34-mongo-c-driver-devel but seems like it should - 

/opt/rh/rh-mongodb34/root/usr/include/libmongoc-1.0/mongoc.h:#include <bson.h>

and likewise -

/opt/rh/rh-mongodb36/root/usr/include/libmongoc-1.0/mongoc.h:#include <bson.h>