umask problem (PR#7086)

Hello

R-1.9.0
when the user that compiles R has umask 027 and root has umask 022, then
R is installed incorrectly:
clock@beton:~$ R
/usr/bin/R: line 156: /usr/lib/R/bin/R.bin: Permission denied
/usr/bin/R: line 156: exec: /usr/lib/R/bin/R.bin: cannot execute: Success
clock@beton:~$ ls -la /usr/lib/R/bin/R.bin
-rwxr-x---    1 root     root      2032542 Jul 13 20:04 /usr/lib/R/bin/R.bin
       ^^^

Cl<