bin/runcpu: eliminate hardcoded sysroot

src/bin/runcpu.ts

@@ -128,7 +128,7 @@ const specProc = await spawnSPECWithID(
             ...optimizeFlags,
             ...argv.allowMisaligned ? ["-mllvm", sw64UnalignedFlag] : [],
             ...sw64TargetOptions({ simd: argv.simd }),
-            ...["--sysroot", "/usr/sw/swgcc1030_native_tools"],
+            ...["--sysroot", sysroot],
             ...argv.compilerSuite == "llvm" ? [sunway.mcpu(sunwayGeneration)] : [], // Only add -mcpu for llvm
         ],
         ldflags: [
@@ -136,7 +136,7 @@ const specProc = await spawnSPECWithID(
             `-L${path.resolve(prefix, 'lib')}`,
             ...optimizeFlags,
             "-fuse-ld=lld",
-            ...["--sysroot", "/usr/sw/swgcc1030_native_tools"],
+            ...["--sysroot", sysroot],
             ...argv.optimizeProfile === "base" ? [
                 ...argv.simd ? ["-Wl,-plugin-opt,-mattr=+simd"] : [],
                 ...argv.allowMisaligned ? [`-Wl,-plugin-opt,${sw64UnalignedFlag}`] : [],