Extend installation to install the two Go packages.

By default, we are installing "libcap/cap" and "libcap/psx"
in "/usr/share/gocode/src/". To make this work, we also install
"libpsx.a" with "libcap.*".

[If anyone wants to contribute a go .pc/.pc.in file for the Go
packages, that would be appreciated.]

Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
diff --git a/Make.Rules b/Make.Rules
index ab4f17c..b6fbf6d 100644
--- a/Make.Rules
+++ b/Make.Rules
@@ -36,6 +36,7 @@
 INCDIR=$(inc_prefix)/include
 LIBDIR=$(lib_prefix)/$(lib)
 PKGCONFIGDIR=$(prefix)/$(lib)/pkgconfig
+GOPKGDIR=$(prefix)/share/gocode/src
 
 # common defines for libcap
 LIBTITLE=libcap