dev-ada/gprbuild: add gcc:16 support

Signed-off-by: Alfredo Tupone <tupone@gentoo.org>

dev-ada/gprbuild/files/gprbuild-25.0.0-gcc16.patch

@@ -0,0 +1,22 @@
+--- a/gpr/src/gpr-compilation-process.adb	2025-12-02 20:16:02.856971670 +0100
++++ b/gpr/src/gpr-compilation-process.adb	2025-12-02 20:16:18.920776145 +0100
+@@ -41,7 +41,7 @@
+    --  A set of key=value
+ 
+    package Prj_Maps is new Containers.Indefinite_Ordered_Maps
+-     (String, Env_Maps.Map, Env_Maps."<", Env_Maps."=");
++     (String, Env_Maps.Map, "<", Env_Maps."=");
+    --  A set of project+language=map
+ 
+    function "<" (Left, Right : Id) return Boolean is
+--- a/gpr/src/gpr-compilation-protocol.adb	2025-12-02 20:38:54.332285274 +0100
++++ b/gpr/src/gpr-compilation-protocol.adb	2025-12-02 20:39:35.690782208 +0100
+@@ -978,7 +978,7 @@
+       Set_File_Last_Modify_Time_Stamp
+         (Path_Name,
+          To_Ada
+-           (time_t
++           (Long_Long_Integer
+               (Conversions.To_Unix_Time
+                  (Time_Of
+                     (TS (1, 4), TS (5, 6), TS (7, 8),

dev-ada/gprbuild/gprbuild-25.0.0-r5.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=8
 
-ADA_COMPAT=( gcc_{12..15} )
+ADA_COMPAT=( gcc_{12..16} )
 PYTHON_COMPAT=( python3_{10..13} pypy3{,_11} )
 inherit ada python-any-r1 multiprocessing
 
@@ -32,7 +32,10 @@ BDEPEND="doc? (
 )"
 
 REQUIRED_USE="${ADA_REQUIRED_USE}"
-PATCHES=( "${FILESDIR}"/${PN}-22.0.0-gentoo.patch )
+PATCHES=(
+	"${FILESDIR}"/${PN}-22.0.0-gentoo.patch
+	"${FILESDIR}"/${P}-gcc16.patch
+)
 
 python_check_deps() {
 	python_has_version "dev-python/sphinx[${PYTHON_USEDEP}]"