MT#58307 debian: Install shared libraries into multi-arch directories

This makes it possible to mark the shared library packages as Multi-Arch
same.

Change-Id: I2d19bfbede5c77a1661858e787af1338885bdad4

debian/control

@@ -11,6 +11,7 @@ Build-Depends:
 
 Package: ngcp-libtcap1
 Architecture: any
+Multi-Arch: same
 Depends:
  ${misc:Depends},
  ${shlibs:Depends},

debian/ngcp-libtcap-dev.install

@@ -1,2 +1,2 @@
 usr/include
-usr/lib/*.so
+usr/lib/*/*.so

debian/ngcp-libtcap1.install

@@ -1 +1 @@
-usr/lib/*.so.*
+usr/lib/*/*.so.*

debian/rules

@@ -2,7 +2,10 @@
 # Uncomment this to turn on verbose mode.
 # export DH_VERBOSE=1
 
+include /usr/share/dpkg/architecture.mk
+
 export PREFIX = /usr
+export LIBDIR = /usr/lib/$(DEB_HOST_MULTIARCH)
 
 %:
 	dh $@