Switch to the more common idiom for scripts in genrules.

Bug: http://b/198619163
Test: treehugger
Change-Id: I8a6e9e179aef45e1b0622a2e15f80f92041f9736
diff --git a/libm/Android.bp b/libm/Android.bp
index 7469cde..641956c 100644
--- a/libm/Android.bp
+++ b/libm/Android.bp
@@ -560,30 +560,30 @@
     name: "libm.arm.map",
     out: ["libm.arm.map"],
     srcs: ["libm.map.txt"],
-    tool_files: [":bionic-generate-version-script"],
-    cmd: "$(location :bionic-generate-version-script) arm $(in) $(out)",
+    tools: ["generate-version-script"],
+    cmd: "$(location generate-version-script) arm $(in) $(out)",
 }
 
 genrule {
     name: "libm.arm64.map",
     out: ["libm.arm64.map"],
     srcs: ["libm.map.txt"],
-    tool_files: [":bionic-generate-version-script"],
-    cmd: "$(location :bionic-generate-version-script) arm64 $(in) $(out)",
+    tools: ["generate-version-script"],
+    cmd: "$(location generate-version-script) arm64 $(in) $(out)",
 }
 
 genrule {
     name: "libm.x86.map",
     out: ["libm.x86.map"],
     srcs: ["libm.map.txt"],
-    tool_files: [":bionic-generate-version-script"],
-    cmd: "$(location :bionic-generate-version-script) x86 $(in) $(out)",
+    tools: ["generate-version-script"],
+    cmd: "$(location generate-version-script) x86 $(in) $(out)",
 }
 
 genrule {
     name: "libm.x86_64.map",
     out: ["libm.x86_64.map"],
     srcs: ["libm.map.txt"],
-    tool_files: [":bionic-generate-version-script"],
-    cmd: "$(location :bionic-generate-version-script) x86_64 $(in) $(out)",
+    tools: ["generate-version-script"],
+    cmd: "$(location generate-version-script) x86_64 $(in) $(out)",
 }