dpkg-buildflags(1): Add missing flags affected by hardening options

debian/changelog

@@ -10,6 +10,7 @@ dpkg (1.17.7) UNRELEASED; urgency=low
     - Fix indentation of “Extract options (with -x)” title in dpkg-source(1).
     - Improve symlink <-> directory switch information in
       dpkg-maintscript-helper(1). Closes: #739388
+    - Add missing flags affected by hardening options to dpkg-buildflags(1).
   * Use exit instead of return to exit a subshell in dpkg-maintscript-helper.
     Thanks to Richard Levitte <richard@levitte.org>. Closes: #738957
   * Localize $_ in Perl functions with while (<$fh>) style loops.

man/dpkg-buildflags.1

@@ -241,7 +241,8 @@ glibc 2.16 and later.
 .B stackprotector
 This setting (enabled by default) adds
 .B \-fstack-protector \-\-param=ssp\-buffer\-size=4
-to \fBCFLAGS\fP and \fBCXXFLAGS\fP. This adds safety checks against stack
+to \fBCFLAGS\fP, \fBCXXFLAGS\fP, \fBGCJFLAGS\fP and \fBFFLAGS\fP.
+This adds safety checks against stack
 overwrites. This renders many potential code injection attacks into
 aborting situations. In the best case this turns code injection
 vulnerabilities into denial of service or into non-issues (depending on
@@ -271,8 +272,9 @@ above). The option cannot become enabled if \fBrelro\fP is not enabled.
 .
 .TP
 .B pie
-This setting (disabled by default) adds \fB\-fPIE\fP to \fBCFLAGS\fP and
-\fBCXXFLAGS\fP, and \fB\-fPIE \-pie\fP to \fBLDFLAGS\fP. Position Independent
+This setting (disabled by default) adds \fB\-fPIE\fP to \fBCFLAGS\fP,
+\fBCXXFLAGS\fP, \fBGCJFLAGS\fP and \fBFFLAGS\fP,
+and \fB\-fPIE \-pie\fP to \fBLDFLAGS\fP. Position Independent
 Executable are needed to take advantage of Address Space Layout
 Randomization, supported by some kernel versions. While ASLR can already
 be enforced for data areas in the stack and heap (brk and mmap), the code