I'm running into test failures while building gtk+ 3.17.9 because of test-simplify using #!/bin/sh while relying on bash features. Can we switch it to use #!/bin/bash (or get rid of bashism)?

For reference:

make[4]: Entering directory '/build/gtk+3.0-15GllF/gtk+3.0-3.17.9/debian/build/shared/testsuite/tools'
cp /build/gtk+3.0-15GllF/gtk+3.0-3.17.9/./testsuite/tools/test-simplify.in test-simplify
TEST: test-simplify... (pid=5756)
test-simplify: 7: test-simplify: shopt: not found
test-simplify: 8: test-simplify: Syntax error: "(" unexpected
FAIL: test-simplify



gtk+3.0-3.17.9$ checkbashisms ./testsuite/tools/test-simplify.in
possible bashism in ./testsuite/tools/test-simplify.in line 7 (shopt):
shopt -s nullglob
possible bashism in ./testsuite/tools/test-simplify.in line 13 (bash arrays, ${name[0|*|@]}):
for t in ${TESTS[*]}; do