webrev repo: 7902478: Add webrev flag to avoid printing workspacedefault tip

When running webrev.ksh on the jdk/open, the sdiffs files are not generated for four classes with the following message:

src/java.base/share/classes/java/lang/SecurityManager.java
patch cdiffs udiffs/usr/bin/awk: limited to 50 pat,pat statements at source line 143 source file /tmp/67133.file1
 context is
NR==1497,NR==1498 >>> {changed();next} <<<
/usr/bin/awk: limited to 50 pat,pat statements at source line 146 source file /tmp/67133.file1
/usr/bin/awk: limited to 50 pat,pat statements at source line 143 source file /tmp/67133.file2
 context is
NR==1497,NR==1498 >>> {changed();next} <<<
/usr/bin/awk: limited to 50 pat,pat statements at source line 146 source file /tmp/67133.file2
 sdiffs frames old new


src/java.base/share/classes/java/util/Calendar.java
patch cdiffs udiffs/usr/bin/awk: limited to 50 pat,pat statements at source line 113 source file /tmp/67133.file1
 context is
NR==1979,NR==1982 >>> {changed();next} <<<
/usr/bin/awk: limited to 50 pat,pat statements at source line 114 source file /tmp/67133.file1
/usr/bin/awk: limited to 50 pat,pat statements at source line 116 source file /tmp/67133.file1
/usr/bin/awk: limited to 50 pat,pat statements at source line 113 source file /tmp/67133.file2
 context is
NR==1979,NR==1982 >>> {changed();next} <<<
/usr/bin/awk: limited to 50 pat,pat statements at source line 114 source file /tmp/67133.file2
/usr/bin/awk: limited to 50 pat,pat statements at source line 116 source file /tmp/67133.file2
 sdiffs frames old new


src/java.base/share/classes/java/util/ResourceBundle.java
patch cdiffs udiffs/usr/bin/awk: limited to 50 pat,pat statements at source line 120 source file /tmp/67133.file1
 context is
NR==2550,NR==2551 >>> {changed();next} <<<
/usr/bin/awk: limited to 50 pat,pat statements at source line 125 source file /tmp/67133.file1
/usr/bin/awk: limited to 50 pat,pat statements at source line 132 source file /tmp/67133.file1
/usr/bin/awk: limited to 50 pat,pat statements at source line 120 source file /tmp/67133.file2
 context is
NR==2550,NR==2551 >>> {changed();next} <<<
/usr/bin/awk: limited to 50 pat,pat statements at source line 125 source file /tmp/67133.file2
/usr/bin/awk: limited to 50 pat,pat statements at source line 132 source file /tmp/67133.file2
 sdiffs frames old new


src/java.base/share/classes/java/util/regex/Matcher.java
patch cdiffs udiffs sdiffs framesdiff: old/src/java.base/share/classes/java/util/regex/Matcher.java: No newline at end of file

 old new