bazel/sqlite3: use minimal copts matching the omnibus baseline

The initial implementation used go-sqlite3's bundled-amalgamation compile
flags (FTS3, R-tree, UPDATE/DELETE LIMIT, WAL synchronous, trace size limit)
on the assumption that they were required for ABI compatibility.  Auditing
the actual go-sqlite3 consumers (MacPorts, Podman, go-rpmdb) shows none of
them exercise those extensions; all queries are simple SELECTs against
regular tables.  The full feature set added ~879 KiB to the package
unnecessarily.

Keep only what the omnibus build already compiled with (MATH_FUNCTIONS,
THREADSAFE=1) plus SQLITE_OMIT_DEPRECATED, which go-sqlite3 includes in
its own bundled build so it never calls the removed APIs.  The heroku /
non-heroku select() is dropped as both flavors now share the same minimal set.

Author: chouquette

deps/sqlite3.BUILD.bazel

@@ -27,20 +27,11 @@ cc_library(
     srcs = ["sqlite3.c"],
     hdrs = _SQLITE3_PUBLIC_HEADERS,
     includes = ["."],
-    # SQLITE_* defines mirror mattn/go-sqlite3's bundled-amalgamation build
-    # (sqlite3.go:13-23) so this shared library is feature-equivalent to the
-    # binding's default flavor.
     copts = [
         "-Wall",
-        "-DSQLITE_DEFAULT_WAL_SYNCHRONOUS=1",
-        "-DSQLITE_ENABLE_FTS3",
-        "-DSQLITE_ENABLE_FTS3_PARENTHESIS",
         "-DSQLITE_ENABLE_MATH_FUNCTIONS",
-        "-DSQLITE_ENABLE_RTREE",
-        "-DSQLITE_ENABLE_UPDATE_DELETE_LIMIT",
         "-DSQLITE_OMIT_DEPRECATED",
         "-DSQLITE_THREADSAFE=1",
-        "-DSQLITE_TRACE_SIZE_LIMIT=15",
         "-O2",
     ],
     linkstatic = True,