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

buildtools/compare_config_h3.sh

@@ -1,10 +1,10 @@
-#!/bin/bash
+#!/bin/sh
 
 # compare the generated config.h from a waf build with existing samba
 # build
 
-grep ^.define bin/default/source3/include/config.h | sort > waf-config.h
-grep ^.define $HOME/samba_old/source3/include/config.h | sort > old-config.h
+grep "^.define" bin/default/source3/include/config.h | sort > waf-config.h
+grep "^.define" $HOME/samba_old/source3/include/config.h | sort > old-config.h
 
 comm -23 old-config.h waf-config.h
 

buildtools/compare_config_h4.sh

@@ -1,10 +1,10 @@
-#!/bin/bash
+#!/bin/sh
 
 # compare the generated config.h from a waf build with existing samba
 # build
 
-grep ^.define bin/default/source4/include/config.h | sort > waf-config.h
-grep ^.define $HOME/samba_old/source4/include/config.h | sort > old-config.h
+grep "^.define" bin/default/source4/include/config.h | sort > waf-config.h
+grep "^.define" $HOME/samba_old/source4/include/config.h | sort > old-config.h
 
 comm -23 old-config.h waf-config.h
 

buildtools/compare_generated.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 # compare the generated files from a waf
 

buildtools/compare_install.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 prefix1="$1"
 prefix2="$2"