s/-/_/g on repository names for newer Bazel

Change-Id: Ifc329f9913da2a97df5ab10fa288c7c2e7c1562d
diff --git a/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcc b/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcc
index 0e306f1..aab008a 100755
--- a/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcc
+++ b/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcc
@@ -1,5 +1,5 @@
 #!/bin/bash --norc
 
 exec \
-	"${BAZEL_OUTPUT_ROOT}external/arm-frc-linux-gnueabi-repo/usr/bin/arm-frc-linux-gnueabi-gcc" \
+	"${BAZEL_OUTPUT_ROOT}external/arm_frc_linux_gnueabi_repo/usr/bin/arm-frc-linux-gnueabi-gcc" \
 	"$@"