Define a common macro for grep needing -U to allow tests to not need
to inquire of specific platforms needing this option. Change
t3032 and t5560 to use this rather than testing explicitly for mingw.
This fixes these two tests on Cygwin.

Signed-off-by: Mark Levedahl <mleved...@gmail.com>
---
This replaces my earlier patch against t3032 (8896b287 on pu)

 t/t3032-merge-recursive-options.sh | 2 +-
 t/t5560-http-backend-noserver.sh   | 2 +-
 t/test-lib.sh                      | 2 ++
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/t/t3032-merge-recursive-options.sh 
b/t/t3032-merge-recursive-options.sh
index 2b17311..5fd7bbb 100755
--- a/t/t3032-merge-recursive-options.sh
+++ b/t/t3032-merge-recursive-options.sh
@@ -14,7 +14,7 @@ test_description='merge-recursive options
 . ./test-lib.sh
 
 test_have_prereq SED_STRIPS_CR && SED_OPTIONS=-b
-test_have_prereq MINGW && export GREP_OPTIONS=-U
+test_have_prereq GREP_STRIPS_CR && export GREP_OPTIONS=-U
 
 test_expect_success 'setup' '
        conflict_hunks () {
diff --git a/t/t5560-http-backend-noserver.sh b/t/t5560-http-backend-noserver.sh
index ef98d95..9be9ae3 100755
--- a/t/t5560-http-backend-noserver.sh
+++ b/t/t5560-http-backend-noserver.sh
@@ -5,7 +5,7 @@ test_description='test git-http-backend-noserver'
 
 HTTPD_DOCUMENT_ROOT_PATH="$TRASH_DIRECTORY"
 
-test_have_prereq MINGW && export GREP_OPTIONS=-U
+test_have_prereq GREP_STRIPS_CR && export GREP_OPTIONS=-U
 
 run_backend() {
        echo "$2" |
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 2d63307..1abea40 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -824,6 +824,7 @@ case $(uname -s) in
        test_set_prereq MINGW
        test_set_prereq NOT_CYGWIN
        test_set_prereq SED_STRIPS_CR
+       test_set_prereq GREP_STRIPS_CR
        ;;
 *CYGWIN*)
        test_set_prereq POSIXPERM
@@ -831,6 +832,7 @@ case $(uname -s) in
        test_set_prereq NOT_MINGW
        test_set_prereq CYGWIN
        test_set_prereq SED_STRIPS_CR
+       test_set_prereq GREP_STRIPS_CR
        ;;
 *)
        test_set_prereq POSIXPERM
-- 
1.8.3.2.0.13

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