Use -O1 with gcc > 6

Upstream-Status: Pending
Signed-off-by: Khem Raj <raj.khem@gmail.com>

diff -r 3d43b280298c lib/libucsi/endianops.h
--- a/lib/libucsi/endianops.h	Fri Mar 21 20:26:36 2014 +0100
+++ b/lib/libucsi/endianops.h	Fri Jan 19 06:56:15 2018 +0000
@@ -33,6 +33,9 @@
 #define __ucsi_packed __attribute__((packed))
 
 
+#if __GNUC__ >= 6 + (0 >= __GNUC_MINOR__)
+#pragma GCC optimize ("O1")
+#endif
 
 
 #if __BYTE_ORDER == __BIG_ENDIAN