Re-applied after reverting our changes to jsonsl.h and jsonsl.c.
Originally #da366bb2.

Waiting for https://github.com/mnunberg/jsonsl/issues/21 upstream

Reverts our clang-format changes (#56402642), our introduction of
bson_malloc / bson_free (#da366bb2), and our change from assert to
BSON_ASSERT (#661e0960). Keep two changes that fix warnings (#a1ca74d8
and #6e0f9c68), which were merged to JSONSL upstream.

Upstream no longer uses "assert()" in the code, although it still
includes assert.h by mistake.

I'll bring bson_malloc / bson_free back in an upcoming commit.

/Users/pnm/code/libbson/src/bson/bson-decimal128.c:102:11: warning: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
/Users/pnm/code/libbson/src/bson/bson-decimal128.c:681:19: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
/Users/pnm/code/libbson/src/bson/bson-decimal128.c:690:19: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'int' [-Wshorten-64-to-32]
/Users/pnm/code/libbson/src/bson/bson-timegm.c:569:15: warning: implicit conversion loses integer precision: 'int64_t' (aka 'long long') to 'int_fast32_t' (aka 'int') [-Wshorten-64-to-32]
/Users/pnm/code/libbson/src/bson/bson.c:2147:4: warning: ambiguous expansion of macro 'va_copy' [-Wambiguous-macro]
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/8.0.0/include/stdarg.h:43:9: note: expanding this definition of 'va_copy'
/Users/pnm/code/libbson/src/bson/bson-compat.h:158:9: note: other definition of 'va_copy'

Work around a bug with certain versions of the aws-cli tool.

No longer needed once we've applied Petr Písař's previous fix that
avoids an integer overflow and ensures GCC 7 compatibility.

There is a signed integer wrap that has an undefined behevior and
GCC 7 knows about it that the compiled code just crashes.

Fix can be verified by building with -fsanitize=undefined option.

<https://jira.mongodb.org/browse/CDRIVER-2010

>

Signed-off-by: Petr Písař <ppisar@redhat.com>
Signed-off-by: A. Jesse Jiryu Davis <jesse@mongodb.com>

Don't mark bson_as_json "deprecated", although it has been superseded by
bson_as_extended_json. There are still legitimate uses for bson_as_json.

Add and test config-version.cmake files, update example CMake style,
more cleanly test in Autotools install-exec-hook whether static linking
is enabled, clearer test matrix.

Whether built with CMake or the Autotools, libbson now installs CMake
config-file packages for bson-1.0 and bson-static-1.0, and pkg-config
files for the same.

Compile and link an example program with all combinations: libbson built
with CMake or the Autotools, using static or dynamic linking, and
finding libbson with the CMake find_package command or with pkg-config.

Distribute separate pkg-config files and CMake config packages for
programs that want to statically link to libbson.

Catch mistakes like CDRIVER-2071.