PHPC-479: Print library version for libmongoc, libbson, and libmongocrypt

[alcaeus]

https://jira.mongodb.org/browse/PHPC-479

Output:

$ ./configure --with-mongodb-system-libs=yes
[...]
Build configuration:
  CFLAGS                                           : -g -O2
  Extra CFLAGS                                     :  
  Developers flags (slow)                          : 
  Code Coverage flags (extra slow)                 : 
  libmongoc                                        : System (1.16.2)
  libbson                                          : System (1.16.2)
  libmongocrypt                                    : None
  LDFLAGS                                          : 
  EXTRA_LDFLAGS                                    : 
  MONGODB_SHARED_LIBADD                            : -Wl,-rpath,/usr/local/Cellar/mongo-c-driver/1.16.2/lib -L/usr/local/Cellar/mongo-c-driver/1.16.2/lib -Wl,-rpath,/usr/local/Cellar/mongo-c-driver/1.16.2/lib -L/usr/local/Cellar/mongo-c-driver/1.16.2/lib  -lbson-1.0 -lmongoc-1.0 -lbson-1.0

$ ./configure --with-mongodb-system-libs=no
[...]
Build configuration:
  CFLAGS                                           : -g -O2
  Extra CFLAGS                                     :  
  Developers flags (slow)                          :
  Code Coverage flags (extra slow)                 :
  libmongoc                                        : Bundled (1.17.0-rc0)
  libbson                                          : Bundled (1.17.0-rc0)
  libmongocrypt                                    : Bundled (1.0.4)
  LDFLAGS                                          :
  EXTRA_LDFLAGS                                    :
  MONGODB_SHARED_LIBADD                            : -framework Security -framework CoreFoundation -lsasl2 -lresolv  -lz