triple: Add riscv32be riscv64be support

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>

Author: lygstate

src/triple.ts

@@ -58,8 +58,10 @@ const TriplePossibleArch: { [index: string]: RegExp } = {
     powerpc: /^powerpc$/,
     powerpcle: /^powerpcle$/,
     rl78: /^rl78/,
-    riscv32: /^riscv32/,
-    riscv64: /^riscv64/,
+    riscv32: /^riscv32$/,
+    riscv32be: /^riscv32be/,
+    riscv64: /^riscv64$/,
+    riscv64be: /^riscv64be/,
     rx: /^rx/,
     s390: /^s390$/,
     s390x: /^s390x$/,