This patch makes the build system pass -Wl,-rpath=$out/lib even for
libraries (it already does so for executables, thanks to 'DO_GNU_APP'
in 'Makefile.shared'.)

--- openssl-1.0.2a/Makefile.shared	2015-04-05 01:07:35.357602454 +0200
+++ openssl-1.0.2a/Makefile.shared	2015-04-05 01:09:50.474513303 +0200
@@ -106,7 +106,7 @@ LINK_SO=	\
     LIBPATH=`for x in $$LIBDEPS; do echo $$x; done | sed -e 's/^ *-L//;t' -e d | uniq`; \
     LIBPATH=`echo $$LIBPATH | sed -e 's/ /:/g'`; \
     LD_LIBRARY_PATH=$$LIBPATH:$$LD_LIBRARY_PATH \
-    $${SHAREDCMD} $${SHAREDFLAGS} \
+    $${SHAREDCMD} $${SHAREDFLAGS} -Wl,-rpath,$(LIBRPATH) \
 	-o $$SHLIB$$SHLIB_SOVER$$SHLIB_SUFFIX \
 	$$ALLSYMSFLAGS $$SHOBJECTS $$NOALLSYMSFLAGS $$LIBDEPS \
   ) && $(SYMLINK_SO)
;'>
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<tr><td><span title='2022-12-04 21:33:28 +0200'>2022-12-04</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=784b4c30dd0ed7bd2c55e7f8f1c6af240864dee9'>gnu: Remove rust-glib-0.8.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-10-24 17:40:09 +0300'>2022-10-24</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=935ac2f449e48fce8a488d57e0cf7df1c0d52eba'>gnu: Remove rust-cairo-rs-0.7.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-10-24 17:40:09 +0300'>2022-10-24</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=1a7b2cb28c5c18b0ae9c9e416ebb08612f74be43'>gnu: Remove rust-gio-0.7.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-10-24 17:40:09 +0300'>2022-10-24</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=84f2bc02b7182d0a03633974c4fbdf8d28b6fe98'>gnu: Remove rust-pango-0.7.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-10-24 10:46:03 +0300'>2022-10-24</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=66bcbea9a3513a91664c3427307f83ad11a1ed4c'>gnu: Remove rust-gdk-pixbuf-0.7.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-10-24 10:46:03 +0300'>2022-10-24</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=853efcd3d092006bebf855c37363f370c857f5e9'>gnu: Remove rust-pangocairo-0.8.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2022-09-15 10:20:32 -0400'>2022-09-15</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=3d297a0017210f1dd135592efb10846840a8af88'>Merge branch 'master' into staging</a><span class='msg-avail'>...</span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2022-09-14 09:33:11 +0100'>2022-09-14</span></td><td><a href='/guix/commit/gnu/packages/crates-gtk.scm?id=fa4fffbd08890c5a66096b712380b9737aeb1a93'>gnu: Add comments to the bottom of a few more package modules.</a><span class='msg-avail'>...</span></td><td>Christopher Baines</td></tr>