Don't forcibly strip the binaries.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Upstream-Status: Backport [d7693eea09ac76c67f5f3aa538bb911ce2291e2c]

diff --git a/Makefile b/Makefile
index 6a9803c..170c0ce 100644
--- a/Makefile
+++ b/Makefile
@@ -285 +285 @@ install.bin: glew.bin
-	$(INSTALL) -s -m 0755 bin/$(GLEWINFO.BIN) bin/$(VISUALINFO.BIN) "$(DESTDIR)$(BINDIR)/"
+	$(INSTALL) -m 0755 bin/$(GLEWINFO.BIN) bin/$(VISUALINFO.BIN) "$(DESTDIR)$(BINDIR)/"