engine_spx2html: try to fix released crates.io artifacts

Attempting to work around something that I think is currently a Cargo
issue, reported here:

rust-lang/cargo#10440

Basically, `cargo install tectonic` seems to fail because our
workspace-level `patch.crates-io` statement isn't propagated into the
sub-crate's Cargo artifact. I think I can work around this by adding an
individual patch statement, at the cost of getting a warning every time
I run Cargo.

Author: pkgw

Cargo.toml

@@ -142,7 +142,7 @@ tectonic_cfg_support = "thiscommit:aeRoo7oa"
 tectonic_dep_support = "5faf4205bdd3d31101b749fc32857dd746f9e5bc"
 tectonic_docmodel = "thiscommit:2022-02-20:2SpEl4c"
 tectonic_engine_bibtex = "thiscommit:2021-01-17:KuhaeG1e"
-tectonic_engine_spx2html = "thiscommit:2021-10-29:96yOlD8"
+tectonic_engine_spx2html = "thiscommit:2022-03-01:lfIdfFH"
 tectonic_engine_xdvipdfmx = "7dcbc52e58f9774b3d592919a9105377faeac509"
 tectonic_engine_xetex = "thiscommit:2022-02-20:J4dXT3x"
 tectonic_errors = "317ae79ceaa2593fb56090e37bf1f5cc24213dd9"

crates/engine_spx2html/Cargo.toml

@@ -29,6 +29,12 @@ tectonic_xdv = { path = "../xdv", version = "0.0.0-dev.0" }
 tempfile = "^3.1"
 tera = "^1.13"
 
+# This statement currently (2022 Mar) leads to a warning on every Cargo invocation,
+# but I think that is needed for `cargo install tectonic` to work with released
+# packages: https://github.com/rust-lang/cargo/issues/10440 :-(
+[patch.crates-io]
+pinot = { git = 'https://github.com/tectonic-typesetting/pinot', branch = 'basic-math' }
+
 [package.metadata.internal_dep_versions]
 tectonic_bridge_core = "4e16bf963700aae59772a6fb223981ceaa9b5f57"
 tectonic_errors = "317ae79ceaa2593fb56090e37bf1f5cc24213dd9"