build: sanitize linking of tools and test programs

This makes sure proper linker arguments are used for the tools and
test programs when shared libraries are enabled.  The tools are
linked using the usual -l flag while for test programs the full
name of the static library is used.
Signed-off-by: Mans Rullgard <mans@mansr.com>

library.mak

@@ -34,8 +34,11 @@ install-libs-$(CONFIG_STATIC): install-lib$(NAME)-static
 install-libs-$(CONFIG_SHARED): install-lib$(NAME)-shared
 
 define RULES
+$(EXAMPLES) $(TOOLS): LIB = $(FULLNAME:%=$(LD_LIB))
+$(TESTPROGS):         LIB = $(SUBDIR)$(LIBNAME)
+
 $(EXAMPLES) $(TESTPROGS) $(TOOLS): %$(EXESUF): %.o
-	$$(LD) $(LDFLAGS) $$(LD_O) $$^ $(FFEXTRALIBS) $$(ELIBS)
+	$$(LD) $(LDFLAGS) $$(LD_O) $$(filter %.o,$$^) $$(LIB) $(FFEXTRALIBS) $$(ELIBS)
 
 $(SUBDIR)$(SLIBNAME): $(SUBDIR)$(SLIBNAME_WITH_MAJOR)
 	$(Q)cd ./$(SUBDIR) && $(LN_S) $(SLIBNAME_WITH_MAJOR) $(SLIBNAME)