tests: remove 'hghave symlink' from test-import-git.t

The test had a long chain of commits depending on execbits in some of first
commits. The hashes are checked throughout the file, so there was no elegant
way to make it pass both with and without execbits.

We now rollback the execbits-or-not commits and make a stable change instead.
The hash chain is thus updated once but is now a bit more stable. The test
coverage should be unaltered.

tests/test-import-git.t

@@ -1,6 +1,5 b''
-  $ "$TESTDIR/hghave" symlink || exit 80
-
-  $ hg init
+  $ hg init repo
+  $ cd repo
 
 New file:
 
@@ -41,14 +40,19 b' chmod +x:'
   > EOF
   applying patch from stdin
 
+#if execbit
   $ hg tip -q
   2:3a34410f282e
-
   $ test -x new
+  $ hg rollback -q
+#else
+  $ hg tip -q
+  1:ab199dc869b5
+#endif
 
-Copy:
+Copy and removing x bit:
 
-  $ hg import -d "1000000 0" -mcopy - <<EOF
+  $ hg import -f -d "1000000 0" -mcopy - <<EOF
   > diff --git a/new b/copy
   > old mode 100755
   > new mode 100644
@@ -62,16 +66,37 b' Copy:'
   > EOF
   applying patch from stdin
 
-  $ hg tip -q
-  3:37bacb7ca14d
-
+  $ test -f copy
 #if execbit
-  $ test -f copy
   $ test ! -x copy
   $ test -x copyx
+  $ hg tip -q
+  2:21dfaae65c71
 #else
+  $ hg tip -q
+  2:0efdaa8e3bf3
+#endif
+
+  $ hg up -qCr1
+  $ hg rollback -q
+
+Copy (like above but independent of execbit):
+
+  $ hg import -d "1000000 0" -mcopy - <<EOF
+  > diff --git a/new b/copy
+  > similarity index 100%
+  > copy from new
+  > copy to copy
+  > diff --git a/new b/copyx
+  > similarity index 100%
+  > copy from new
+  > copy to copyx
+  > EOF
+  applying patch from stdin
+
+  $ hg tip -q
+  2:0efdaa8e3bf3
   $ test -f copy
-#endif
 
   $ cat copy
   a
@@ -90,7 +115,7 b' Rename:'
   applying patch from stdin
 
   $ hg tip -q
-  4:47b81a94361d
+  3:b1f57753fad2
 
   $ hg locate
   copyx
@@ -112,7 +137,7 b' Delete:'
   applying patch from stdin
 
   $ hg tip -q
-  5:d9b001d98336
+  4:1bd1da94b9b2
 
   $ hg locate
   empty
@@ -139,7 +164,7 b' Regular diff:'
   applying patch from stdin
 
   $ hg tip -q
-  6:ebe901e7576b
+  5:46fe99cb3035
 
 Copy and modify:
 
@@ -162,7 +187,7 b' Copy and modify:'
   applying patch from stdin
 
   $ hg tip -q
-  7:18f368958ecd
+  6:ffeb3197c12d
 
   $ hg cat copy2
   a
@@ -192,7 +217,7 b' Rename and modify:'
   applying patch from stdin
 
   $ hg tip -q
-  8:c32b0d7e6f44
+  7:401aede9e6bb
 
   $ hg locate copy2
   [1]
@@ -216,10 +241,10 b' One file renamed multiple times:'
   applying patch from stdin
 
   $ hg tip -q
-  9:034a6bf95330
+  8:2ef727e684e8
 
   $ hg log -vr. --template '{rev} {files} / {file_copies}\n'
-  9 rename2 rename3 rename3-2 / rename3 (rename2)rename3-2 (rename2)
+  8 rename2 rename3 rename3-2 / rename3 (rename2)rename3-2 (rename2)
 
   $ hg locate rename2 rename3 rename3-2
   rename3
@@ -260,7 +285,7 b' Binary files and regular patch hunks:'
   applying patch from stdin
 
   $ hg tip -q
-  11:c39bce63e786
+  10:27377172366e
 
   $ cat foo2
   foo
@@ -289,7 +314,7 b' Multiple binary files:'
   applying patch from stdin
 
   $ hg tip -q
-  12:30b530085242
+  11:18b73a84b4ab
 
   $ hg manifest --debug | grep mbinary
   045c85ba38952325e126c70962cc0f9d9077bc67 644   mbinary1
@@ -309,7 +334,7 b' Filenames with spaces:'
   applying patch from stdin
 
   $ hg tip -q
-  13:04750ef42fb3
+  12:47500ce1614e
 
   $ cat "foo bar"
   foo
@@ -332,7 +357,7 b' Copy then modify the original file:'
   applying patch from stdin
 
   $ hg tip -q
-  14:c4cd9cdeaa74
+  13:6757efb07ea9
 
   $ cat foo3
   foo
@@ -367,8 +392,8 b' Move text file and patch as binary'
 Invalid base85 content
 
   $ hg rollback
-  repository tip rolled back to revision 15 (undo import)
-  working directory now based on revision 15
+  repository tip rolled back to revision 14 (undo import)
+  working directory now based on revision 14
   $ hg revert -aq
   $ hg import -d "1000000 0" -m invalid-binary - <<"EOF"
   > diff --git a/text2 b/binary2
@@ -533,6 +558,8 b' Copy and changes with existing destinati'
   $ cat b
   b
 
+#if symlink
+
   $ ln -s b linkb
   $ hg add linkb
   $ hg ci -m addlinkb
@@ -555,6 +582,8 b' Copy and changes with existing destinati'
   ? b.rej
   ? linkb.rej
 
+#endif
+
 Test corner case involving copies and multiple hunks (issue3384)
 
   $ hg revert -qa