Explicitly enable object Cargo features (#1926)

cargo-pgrx only works if we enable a minimal set of Cargo features for
for the object crate, that we implicitly enable despite having set
object to be `default-features = false`!

The Cargo feature resolver has unified our "std" feature for object with
the requested object features of our other dependencies that also depend
on the object crate. However, these dependencies do so conditionally,
based on the platform that they are compiling on. This means that if
other dependencies stop using the object crate, or with less features,
our enabled Cargo features for object will no longer be the correct set
to build our own binary!

This also implies some platforms are simply unable to build cargo-pgrx.
Even if we don't support these platforms explicitly, we have generally
taken a "smoke 'em if you got 'em" approach for unsupported platforms.
Thus, enable enough of object's Cargo features to prevent weird problems
from surfacing in the future through unrelated dependency changes, and
make the cargo-pgrx build effectively platform-invariant.

Whether it actually works on those platforms is a "them" problem, but
now they should be able to actually get to debugging it a bit.

cargo-pgrx/Cargo.toml

@@ -41,11 +41,6 @@ jobslot = "0.2.12" # as seen in gmake -j{N}
 semver = "1.0.20" # checking pgrx versions match
 tempfile = "3.8.0"
 
-# SQL schema generation
-object = { version = "0.32.1", default-features = false, features = [ "std" ] }
-proc-macro2.workspace = true
-quote.workspace = true
-
 # emit better diagnostics
 color-eyre = "0.6.2"
 eyre.workspace = true
@@ -63,6 +58,18 @@ tar = "0.4.40"
 ureq = { version = "2.8.0", default-features = false, features = [ "gzip" ] }
 url.workspace = true
 
+# SQL schema generation
+proc-macro2.workspace = true
+quote.workspace = true
+[dependencies.object]
+version = "0.32.2"
+default-features = false
+features = [
+    "read_core", "std", # we use object read-only and like having actual errors
+    "coff", "elf", "macho", "pe", "xcoff", # support all object formats to allow cross-builds
+]
+
+
 [features]
 default = ["rustls"]
 native-tls = ["ureq/native-tls"]