Add -R alias to -r for scp(1)

[Kurt Mosiejczuk]

cp(1) uses -R for recursive copy. scp(1) uses -r. This diff adds -R as an
alias for -r to scp(1) for those assuming consistency with cp(1).

--Kurt

Index: scp.1
===================================================================
RCS file: /cvs/src/usr.bin/ssh/scp.1,v
retrieving revision 1.87
diff -u -p -r1.87 scp.1
--- scp.1       30 Nov 2019 07:07:59 -0000      1.87
+++ scp.1       2 Jan 2020 01:08:01 -0000
@@ -215,6 +215,12 @@ Recursively copy entire directories.
 Note that
 .Nm
 follows symbolic links encountered in the tree traversal.
+.It Fl R
+A synonym for
+.Fl r .
+(To mimic the
+.Xr cp 1
+flag for recursive copy).
 .It Fl S Ar program
 Name of
 .Ar program
Index: scp.c
===================================================================
RCS file: /cvs/src/usr.bin/ssh/scp.c,v
retrieving revision 1.206
diff -u -p -r1.206 scp.c
--- scp.c       9 Sep 2019 02:31:19 -0000       1.206
+++ scp.c       2 Jan 2020 01:08:01 -0000
@@ -404,7 +404,7 @@ main(int argc, char **argv)
 
        fflag = Tflag = tflag = 0;
        while ((ch = getopt(argc, argv,
-           "dfl:prtTvBCc:i:P:q12346S:o:F:J:")) != -1) {
+           "dfl:pRrtTvBCc:i:P:q12346S:o:F:J:")) != -1) {
                switch (ch) {
                /* User-visible flags. */
                case '1':
@@ -452,6 +452,7 @@ main(int argc, char **argv)
                case 'p':
                        pflag = 1;
                        break;
+               case 'R':
                case 'r':
                        iamrecursive = 1;
                        break;