lang/rust, Mk/Uses/cargo.mk: Drop gmake build dependency for backtrace-sys

The backtrace-sys crate no longer needs gmake since 0.1.20.
sysutils/flowgger still uses backtrace-sys-0.1.14.  Since it is the
only USES=cargo port left that needs it, move the gmake dependency
directly to it instead.

lang/rust currently has backtrace-sys-0.1.30.  It also vendors
jemalloc-sys (which also needs gmake to build) but it is hidden
behind rustc's jemalloc feature which we do not currently activate.
It should be safe to remove gmake in lang/rust too.

PR:		242267
Reported by:	mikael.urankar@gmail.com

Mk/Uses/cargo.mk

@@ -119,10 +119,6 @@ CARGO_TEST_ARGS+=	--release
 CARGO_INSTALL_ARGS+=	--debug
 .endif
 
-.if ${CARGO_CRATES:Mbacktrace-sys-[0-9]*}
-BUILD_DEPENDS+=	gmake:devel/gmake
-.endif
-
 .if ${CARGO_CRATES:Mcmake-[0-9]*}
 BUILD_DEPENDS+=	cmake:devel/cmake
 .endif

lang/rust/Makefile

@@ -35,8 +35,7 @@ IGNORE_FreeBSD_11_powerpc64=	is missing a bootstrap for FreeBSD 11.x powerpc64
 ONLY_FOR_ARCHS?=	aarch64 amd64 armv6 armv7 i386 powerpc64
 ONLY_FOR_ARCHS_REASON=	requires prebuilt bootstrap compiler
 
-BUILD_DEPENDS=	cmake:devel/cmake \
-		gmake:devel/gmake
+BUILD_DEPENDS=	cmake:devel/cmake
 LIB_DEPENDS=	libcurl.so:ftp/curl \
 		libgit2.so:devel/libgit2 \
 		libssh2.so:security/libssh2

net-im/fractal/Makefile

@@ -12,7 +12,7 @@ COMMENT=	GTK+ Matrix IM client
 LICENSE=	GPLv3+
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
-# gmake for the backtrace-sys crate
+# gmake for the gettext-sys crate
 BUILD_DEPENDS=	cargo:lang/${RUST_DEFAULT} \
 		gmake:devel/gmake
 LIB_DEPENDS=	libdbus-1.so:devel/dbus \

sysutils/flowgger/Makefile

@@ -12,6 +12,9 @@ COMMENT=	Fast data collector
 LICENSE=	MPL20
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+# for backtrace-sys < 0.1.24
+BUILD_DEPENDS=	gmake:devel/gmake
+
 USES=		cargo ssl
 USE_GITHUB=	yes
 GH_ACCOUNT=	jedisct1