Fixes error during make:

"No rule to make target '../src/libemilia_pin.a', needed by 'pinball'.  Stop."

--- pinball-0.3.1/src/Makefile.in	2003-12-10 05:34:47.000000000 -0600
+++ pinball-0.3.1/src/Makefile.in	2016-01-31 22:29:13.134519889 -0600
@@ -116,7 +116,7 @@
 
 INCLUDES = -I../base -I../addon @INCLTDL@
 
-pinball_LDADD = ../src/libemilia_pin.a ../addon/libemilia_addon.a ../base/libemilia_base.a @LIBLTDL@
+pinball_LDADD = libemilia_pin.a ../addon/libemilia_addon.a ../base/libemilia_base.a @LIBLTDL@
 pinball_LDFLAGS = -export-dynamic
 
 pinball_SOURCES = Pinball.cpp
@@ -174,7 +174,7 @@
 
 am_pinball_OBJECTS = Pinball.$(OBJEXT)
 pinball_OBJECTS = $(am_pinball_OBJECTS)
-pinball_DEPENDENCIES = ../src/libemilia_pin.a ../addon/libemilia_addon.a \
+pinball_DEPENDENCIES = libemilia_pin.a ../addon/libemilia_addon.a \
 	../base/libemilia_base.a
 
 DEFS = @DEFS@
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<tr><td><span title='2017-12-17 17:22:31 +0100'>2017-12-17</span></td><td><a href='/guix/commit/gnu/packages/nutrition.scm?id=217f704c6aa6a95caea0ebb7a252b8b2f1d78860'>gnu: gourmet: Fix runtime failure and enhance plugin.</a><span class='msg-avail'>...</span></td><td>Mark Meyer</td></tr>
<tr><td><span title='2017-11-17 22:36:27 +0100'>2017-11-17</span></td><td><a href='/guix/commit/gnu/packages/nutrition.scm?id=a8714bf6801cf5058fd02bcb1d352a99d12bc870'>gnu: Move database packages from python.scm to databases.scm.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>