only symlink development libraries when needed

We dont want to generate symlinks when the libdir is the same as the
devlibdir, otherwise we clobber the real files with broken symlinks.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Nathan Scott <nscott@aconex.com>
diff --git a/include/buildmacros b/include/buildmacros
index db761b4..bffe891 100644
--- a/include/buildmacros
+++ b/include/buildmacros
@@ -74,9 +74,11 @@
 	../$(INSTALL) -m 644 $(LIBNAME).lai $(PKG_DEVLIB_DIR)/$(LIBNAME).la ; \
 	../$(INSTALL) -m 755 -d $(PKG_LIB_DIR); \
 	../$(INSTALL) -T so_base $(LIBNAME).lai $(PKG_LIB_DIR); \
+	if test "x$(PKG_DEVLIB_DIR)" != "x$(PKG_LIB_DIR)" ; then \
 	../$(INSTALL) -S $(PKG_DEVLIB_DIR)/$(LIBNAME).a $(PKG_LIB_DIR)/$(LIBNAME).a; \
 	../$(INSTALL) -S $(PKG_DEVLIB_DIR)/$(LIBNAME).la $(PKG_LIB_DIR)/$(LIBNAME).la; \
-	../$(INSTALL) -S $(PKG_LIB_DIR)/$(LIBNAME).so $(PKG_DEVLIB_DIR)/$(LIBNAME).so
+	../$(INSTALL) -S $(PKG_LIB_DIR)/$(LIBNAME).so $(PKG_DEVLIB_DIR)/$(LIBNAME).so; \
+	fi
 else
 INSTALL_LTLIB_DEV = $(INSTALL_LTLIB_STATIC)
 endif