lang/rust: Make OpenSSL use the system default truststore in Cargo

Cargo uses curl-rust and git2-rs (which uses curl-rest as well).
Unfortunately, git2-rs calls openssl_probe::init_ssl_cert_env_vars()
unconditionally which breaks the process environment by setting an invalid
value for SSL_CERT_DIR and then the system default truststore is circumvented,
resulting in certificate validation errors even if certctl(8) manages
everything nicely.

Upstream issues:
* alexcrichton/openssl-probe#37
* rust-lang/git2-rs#1130

Reviewed by:	jrm (mentor), mikael (rust)
MFH:		2025Q1
Differential Revision:	https://reviews.freebsd.org/D49120

Author: michael-o

lang/rust/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	rust
 PORTVERSION?=	1.85.0
-PORTREVISION?=	0
+PORTREVISION?=	1
 CATEGORIES=	lang
 MASTER_SITES=	https://static.rust-lang.org/dist/:src \
 		https://dev-static.rust-lang.org/dist/:src \

lang/rust/files/patch-vendor_git2-0.19.0_src_lib.rs

@@ -0,0 +1,18 @@
+--- vendor/git2-0.19.0/src/lib.rs.orig	2025-02-21 20:02:44 UTC
++++ vendor/git2-0.19.0/src/lib.rs
+@@ -759,6 +759,7 @@ fn init() {
+     unix,
+     not(target_os = "macos"),
+     not(target_os = "ios"),
++    not(target_os = "freebsd"),
+     feature = "https"
+ ))]
+ fn openssl_env_init() {
+@@ -880,6 +881,7 @@ fn openssl_env_init() {
+     windows,
+     target_os = "macos",
+     target_os = "ios",
++    target_os = "freebsd",
+     not(feature = "https")
+ ))]
+ fn openssl_env_init() {}