community/nodejs-current: disable on riscv64

Although riscv64 should be supported it fails to build, disable for now.

../deps/v8/src/codegen/riscv64/macro-assembler-riscv64.h:222:8: error: 'void v8::internal::TurboAssembler::JumpCodeObject(v8::internal::Register)' marked 'override', but does not override
  222 |   void JumpCodeObject(Register code_object) override;

nodejs/node#37980

community/nodejs-current/APKBUILD

@@ -43,7 +43,7 @@ pkgver=16.3.0
 pkgrel=0
 pkgdesc="JavaScript runtime built on V8 engine - current stable version"
 url="https://nodejs.org/"
-arch="all !mips64 !mips64el"
+arch="all !mips64 !mips64el !riscv64"
 license="MIT"
 depends="ca-certificates"
 depends_dev="libuv"
@@ -90,6 +90,7 @@ build() {
 
 	case "$CARCH" in
 		mips*) _carchflags="--with-mips-arch-variant=r1 --with-mips-float-abi=soft";;
+		riscv64) _carchflags="--dest-cpu=riscv64";
 	esac
 
 	./configure --prefix=/usr \