test prerequisites: enumerate with commas

test_have_prereq does understand multiple predicates given as
separate arguments, but that is by accident.  We should list the
prerequisites just like we use them as the (first) optional
parameter for test_expect_success, concatenated with commas, for
consistency.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9809-git-p4-client-view.sh

@@ -365,7 +365,7 @@ test_expect_success 'wildcard files submit back to p4, client-spec case' '
 	(
 		cd "$git" &&
 		echo git-wild-hash >dir1/git-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			echo git-wild-star >dir1/git-wild\*star
 		fi &&
@@ -379,7 +379,7 @@ test_expect_success 'wildcard files submit back to p4, client-spec case' '
 	(
 		cd "$cli" &&
 		test_path_is_file dir1/git-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			test_path_is_file dir1/git-wild\*star
 		fi &&

t/t9812-git-p4-wildcards.sh

@@ -14,7 +14,7 @@ test_expect_success 'add p4 files with wildcards in the names' '
 		printf "file2\nhas\nsome\nrandom\ntext\n" >file2 &&
 		p4 add file2 &&
 		echo file-wild-hash >file-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			echo file-wild-star >file-wild\*star
 		fi &&
@@ -31,7 +31,7 @@ test_expect_success 'wildcard files git p4 clone' '
 	(
 		cd "$git" &&
 		test -f file-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			test -f file-wild\*star
 		fi &&
@@ -46,7 +46,7 @@ test_expect_success 'wildcard files submit back to p4, add' '
 	(
 		cd "$git" &&
 		echo git-wild-hash >git-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			echo git-wild-star >git-wild\*star
 		fi &&
@@ -60,7 +60,7 @@ test_expect_success 'wildcard files submit back to p4, add' '
 	(
 		cd "$cli" &&
 		test_path_is_file git-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			test_path_is_file git-wild\*star
 		fi &&
@@ -75,7 +75,7 @@ test_expect_success 'wildcard files submit back to p4, modify' '
 	(
 		cd "$git" &&
 		echo new-line >>git-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			echo new-line >>git-wild\*star
 		fi &&
@@ -89,7 +89,7 @@ test_expect_success 'wildcard files submit back to p4, modify' '
 	(
 		cd "$cli" &&
 		test_line_count = 2 git-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			test_line_count = 2 git-wild\*star
 		fi &&
@@ -152,7 +152,7 @@ test_expect_success 'wildcard files submit back to p4, delete' '
 	(
 		cd "$cli" &&
 		test_path_is_missing git-wild#hash &&
-		if test_have_prereq !MINGW !CYGWIN
+		if test_have_prereq !MINGW,!CYGWIN
 		then
 			test_path_is_missing git-wild\*star
 		fi &&