Remove soft links in the build directory, not the source directory (Bug#43312)

client/Makefile.am

@@ -116,10 +116,10 @@ link_sources:
 	  @LN_CP_F@ $(top_srcdir)/sql/$$f $$f; \
 	done; \
 	for f in $(strings_src) ; do \
-	  rm -f $(srcdir)/$$f; \
+	  rm -f $$f; \
 	  @LN_CP_F@ $(top_srcdir)/strings/$$f $$f; \
 	done; \
-	rm -f $(srcdir)/my_user.c; \
+	rm -f my_user.c; \
 	@LN_CP_F@ $(top_srcdir)/sql-common/my_user.c my_user.c;
 	echo timestamp > link_sources;