Convert ERR30-C to use the new dataflow library

Author: jketema

c/cert/src/rules/ERR30-C/ErrnoReadBeforeReturn.ql

@@ -19,7 +19,7 @@
 import cpp
 import codingstandards.c.cert
 import codingstandards.c.Errno
-import semmle.code.cpp.dataflow.DataFlow
+import semmle.code.cpp.dataflow.new.DataFlow
 
 /**
  * A call to an `OutOfBandErrnoSettingFunction`

c/cert/src/rules/ERR30-C/SetlocaleMightSetErrno.ql

@@ -18,7 +18,7 @@
 import cpp
 import codingstandards.c.cert
 import codingstandards.c.Errno
-import semmle.code.cpp.dataflow.DataFlow
+import semmle.code.cpp.dataflow.new.DataFlow
 
 class SetlocaleFunctionCall extends FunctionCall {
   SetlocaleFunctionCall() { this.getTarget().hasGlobalName("setlocale") }

c/cert/test/rules/ERR30-C/ErrnoReadBeforeReturn.expected

@@ -1,4 +1,3 @@
-WARNING: module 'DataFlow' has been deprecated and may be removed in future (ErrnoReadBeforeReturn.ql:46,7-15)
 | test.c:69:7:69:11 | * ... | Do not read `errno` before checking the return value of function $@. | test.c:68:3:68:7 | call to ftell | call to ftell |
 | test.c:69:7:69:11 | call to __errno_location | Do not read `errno` before checking the return value of function $@. | test.c:68:3:68:7 | call to ftell | call to ftell |
 | test.c:70:5:70:10 | call to perror | Do not read `errno` before checking the return value of function $@. | test.c:68:3:68:7 | call to ftell | call to ftell |

c/cert/test/rules/ERR30-C/SetlocaleMightSetErrno.expected

@@ -1,3 +1,2 @@
-WARNING: module 'DataFlow' has been deprecated and may be removed in future (SetlocaleMightSetErrno.ql:70,7-15)
 | test.c:98:3:98:11 | call to setlocale | Do not read `errno` before checking the return value of a call to `setlocale`. |
 | test.c:104:7:104:15 | call to setlocale | The value of `errno` may be different than `0` when `setlocale` is called. The following `errno` check might be invalid. |