[MIPS] Fix issue with sysroot_ld_path.py returning empty string

build/config/posix/BUILD.gn

Index: build/config/posix/BUILD.gn
diff --git a/build/config/posix/BUILD.gn b/build/config/posix/BUILD.gn
index c4198200862c9e805a98e09966d8f2c73230ef76..ccb2364c5fdf128c3f7bd5f48d9482b10e96c18c 100644
--- a/build/config/posix/BUILD.gn
+++ b/build/config/posix/BUILD.gn
@@ -38,12 +38,12 @@ config("runtime_library") {
     ldflags = cflags
 
     # Need to get some linker flags out of the sysroot.
-    ldflags += [ exec_script("sysroot_ld_path.py",
-                             [
-                               rebase_path("//build/linux/sysroot_ld_path.sh",
-                                           root_build_dir),
-                               sysroot,
-                             ],
-                             "value") ]
+    ldflags += exec_script("sysroot_ld_path.py",
+                           [
+                             rebase_path("//build/linux/sysroot_ld_path.sh",
+                                         root_build_dir),
+                             rebase_path(sysroot),
+                           ],
+                           "list lines")
   }
 }