Fix multiple defined symbol errors

Use of __inline__ by projects in bootable/* was causing problems with
clang. Following the BKM and replaced use of __inline__ with
__attribute((__gnu_inline)).

Change-Id: If4ccfded685bb2c9d9c23c9b92ee052208399ef0
Author: Edwin Vane <edwin.vane@intel.com>
Reviewed-by: Kevin P Schoedel <kevin.p.schoedel@intel.com>
diff --git a/minzip/inline_magic.h b/minzip/inline_magic.h
index 8c185e1..59c659f 100644
--- a/minzip/inline_magic.h
+++ b/minzip/inline_magic.h
@@ -18,7 +18,7 @@
 #define MINZIP_INLINE_MAGIC_H_
 
 #ifndef MINZIP_GENERATE_INLINES
-#define INLINE extern __inline__
+#define INLINE extern inline __attribute((__gnu_inline__))
 #else
 #define INLINE
 #endif