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

Change-Id: Ifc329f9913da2a97df5ab10fa288c7c2e7c1562d
diff --git a/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcov b/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcov
index d220b95..a3c71c3 100755
--- a/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcov
+++ b/tools/cpp/arm-frc-linux-gnueabi/arm-frc-linux-gnueabi-gcov
@@ -1,5 +1,5 @@
 #!/bin/bash --norc
 
 exec -a arm-frc-linux-gnueabi-gcov \
-	"${BAZEL_OUTPUT_ROOT}external/arm-frc-linux-gnueabi-repo/usr/bin/arm-frc-linux-gnueabi-gcov" \
+	"${BAZEL_OUTPUT_ROOT}external/arm_frc_linux_gnueabi_repo/usr/bin/arm-frc-linux-gnueabi-gcov" \
 	"$@"