dev-lang/odin: strip only unsupported flags

Odin explicitly builds using `clang++` regardless of toolchain. Older
Odin ebuilds explicitly cleared `CPPFLAGS` and `CXXFLAGS` with the
comment "build_odin.sh sets its own flags. Some gcc flags cause build
failures"; this stripping was later migrated to `strip-flags`.

Full stripping isn't necessary, though: the Odin build script _appends_
its own flags instead of replacing them, and GCC-specific flags can be
stripped using `strip-unsupported-flags` instead.

Closes: https://bugs.gentoo.org/974732
Signed-off-by: Itai Ferber <itai@itaiferber.net>

dev-lang/odin/odin-2026.06.ebuild

@@ -32,7 +32,8 @@ RDEPEND="
 BDEPEND="${RDEPEND}"
 
 src_configure() {
-	strip-flags
+	# Odin explicitly searches for and builds with clang++; unsupported GCC flags need to be stripped.
+	CC=clang CXX=clang++ strip-unsupported-flags
 	default
 }