test-casefolding: fix wrong case on hfs on linux

on linux hfs keeps the old case of the file stored
force it by renameing to another name and back

tests/test-casefolding

@@ -1,41 +1,44
 #!/bin/sh
 
 "$TESTDIR/hghave" icasefs || exit 80
 
 echo '% test file addition with bad case'
 hg init repo1
 cd repo1
 echo a > a
 hg add A
 hg st
 hg ci -m adda
 hg manifest
 cd ..
 
 echo '% test case collision on rename (issue 750)'
 hg init repo2
 cd repo2
 echo a > a
 hg --debug ci -Am adda
 hg mv a A
 # 'a' used to be removed under windows
 test -f a || echo 'a is missing'
 hg st
 cd ..
 
 echo '% test case collision between revisions (issue 912)'
 hg init repo3
 cd repo3
 echo a > a
 hg ci -Am adda
 hg rm a
 hg ci -Am removea
 echo A > A
+# on linux hfs keeps the old case stored, force it
+mv a aa
+mv aa A
 hg ci -Am addA
 # Used to fail under case insensitive fs
 hg up -C 0
 hg up -C
 cd ..