waf/buildtools: use /bin/sh instead of /bin/bash and put ^ in quotes

- some Unix shells actually don't like grep ^foo, use grep "^foo" instead.

- bash is not installed on every system, please avoid #!/bin/bash and
  use #!/bin/sh instead

1 files changed, 1 insertions, 1 deletions

diff --git a/buildtools/compare_generated.sh b/buildtools/compare_generated.sh
index ae20fef37de..ebef8a979bd 100755
--- a/buildtools/compare_generated.sh
+++ b/buildtools/compare_generated.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # compare the generated files from a waf