Link explicitly with libpython under Cygwin (#5571)

* Link explicitly with libpython under Cygwin

As with native Windows Python, we need to explicitly link with
libpython under Cygwin too.

This fixes building extensions under Cygwin.

* bump `target-lexicon` to 0.13.3

0.13.3 added support for Cygwin

Author: lazka

newsfragments/5571.fixed.md

@@ -0,0 +1,2 @@
+Fix linking with libpython under Cygwin
+Bumped `target-lexicon` dependency to 0.13.3 for Cygwin support.

pyo3-build-config/Cargo.toml

@@ -13,11 +13,11 @@ rust-version.workspace = true
 
 [dependencies]
 python3-dll-a = { version = "0.2.12", optional = true }
-target-lexicon = "0.13"
+target-lexicon = "0.13.3"
 
 [build-dependencies]
 python3-dll-a = { version = "0.2.12", optional = true }
-target-lexicon = "0.13"
+target-lexicon = "0.13.3"
 
 [features]
 default = []

pyo3-build-config/src/impl_.rs

@@ -890,6 +890,7 @@ pub fn is_linking_libpython_for_target(target: &Triple) -> bool {
         || target.operating_system == OperatingSystem::Aix
         || target.environment == Environment::Android
         || target.environment == Environment::Androideabi
+        || target.operating_system == OperatingSystem::Cygwin
         || !is_extension_module()
 }