lang/rust: enable RUST_BACKTRACE on powerpc since it seems it works now

lang/rust/Makefile

@@ -1,6 +1,6 @@
 PORTNAME=	rust
 PORTVERSION?=	1.77.0
-PORTREVISION?=	0
+PORTREVISION?=	1
 CATEGORIES=	lang
 MASTER_SITES=	https://static.rust-lang.org/dist/:src \
 		https://dev-static.rust-lang.org/dist/:src \
@@ -34,6 +34,7 @@ CPE_VENDOR=	rust-lang
 
 MAKE_ENV=	DESTDIR=${STAGEDIR} \
 		LIBGIT2_NO_PKG_CONFIG=1 \
+		RUST_BACKTRACE=1 \
 		OPENSSL_DIR="${OPENSSLBASE}"
 TEST_ENV=	${MAKE_ENV} \
 		ALLOW_NONZERO_RLIMIT_CORE=1
@@ -101,13 +102,9 @@ IGNORE=		is only for FreeBSD
 .if ${ARCH} == powerpc
 LIB_DEPENDS+=	libatomic.so:lang/gcc${GCC_DEFAULT}
 MAKE_ENV+=	RUSTFLAGS="-L/usr/local/lib/gcc${GCC_DEFAULT}"
-.else
-MAKE_ENV+=	RUST_BACKTRACE=1
-.endif
-
 # rls doesn't build on rust nightly
 # rls needs 64-bit atomics: it doesn't build on powerpc
-.if !defined(NIGHTLY_DATE) && ${ARCH} != powerpc
+.elif !defined(NIGHTLY_DATE)
 _RUST_TOOLS+=	rls
 _COMPONENTS+=	rls-${_PACKAGE_VERS}-${_RUST_TARGET}
 .endif