dev-tex/tectonic: fix build with rust-1.80

Closes: https://bugs.gentoo.org/920027
Signed-off-by: Takuya Wakazono <pastalian46@gmail.com>

dev-tex/tectonic/files/tectonic-0.15.0-fix-xetex_layout-build.patch

@@ -0,0 +1,12 @@
+https://github.com/tectonic-typesetting/tectonic/commit/d260961426b01f7643ba0f35f493bdb671eeaf3f
+--- a/crates/xetex_layout/build.rs      2024-12-08 10:19:21.243061431 -0000
++++ b/crates/xetex_layout/build.rs      2024-12-08 10:44:13.539667493 -0000
+@@ -86,7 +86,7 @@
+     let mut cppcfg = cc::Build::new();
+
+     let cppflags = [
+-        "-std=c++14",
++        "-std=c++17",
+         "-Wall",
+         "-Wdate-time",
+         "-Wendif-labels",

dev-tex/tectonic/files/tectonic-0.15.0-rust-1.80.patch

@@ -0,0 +1,27 @@
+Fix build with rust-1.80.
+--- a/Cargo.lock        2024-12-08 10:19:21.230061469 -0000
++++ b/Cargo.lock        2024-12-08 10:20:33.419850806 -0000
+@@ -2682,9 +2682,9 @@
+
+ [[package]]
+ name = "time"
+-version = "0.3.34"
++version = "0.3.36"
+ source = "registry+https://github.com/rust-lang/crates.io-index"
+-checksum = "c8248b6521bb14bc45b4067159b9b6ad792e2d6d754d6c41fb50e29fefe38749"
++checksum = "5dfd88e563464686c916c7e46e623e520ddc6d79fa6641390f2e3fa86e83e885"
+ dependencies = [
+  "deranged",
+  "itoa",
+@@ -2705,9 +2705,9 @@
+
+ [[package]]
+ name = "time-macros"
+-version = "0.2.17"
++version = "0.2.18"
+ source = "registry+https://github.com/rust-lang/crates.io-index"
+-checksum = "7ba3a3ef41e6672a2f0f001392bb5dcd3ff0a9992d618ca761a11c3121547774"
++checksum = "3f252a68540fde3a3877aeea552b832b40ab9a69e318efd078774a01ddee1ccf"
+ dependencies = [
+  "num-conv",
+  "time-core",