Scope

• Remove unnecessary libbson-static-1.0 dependency in pkg-config.

Background & Motivation
Following the installation instructions .rpm Packages (RedHat, Suse, and Amazon) pkg-config reports a dependency on libbson-static-1.0:

pkg-config --libs --cflags libmongocrypt
-I/usr/include/mongocrypt  /usr/lib64/libbson-static-1.0.a /usr/lib64/librt.so -pthread -lmongocrypt

The libbson-static-1.0.a is not required to build against the libmongocrypt shared library. libbson-static-1.0.a is not installed with those instructions.

Attempting to compile this file results in an error:

// test.c
#include <mongocrypt/mongocrypt.h>
#include <stdio.h>

int main () {
    printf ("mongocrypt_version=%s", mongocrypt_version(NULL));
}

% gcc test.c $(pkg-config --libs --cflags libmongocrypt)
gcc: error: /usr/lib64/libbson-static-1.0.a: No such file or directory

Removing the dependency of libbson-1.0-static.a succeeds:

gcc test.c -I/usr/include/mongocrypt  /usr/lib64/librt.so -pthread -lmongocrypt