Revert "Use inline keyword without underscores consistently"

This reverts commit 58f06e11122723d68c5cb393aeb4ed1c7a2e7bfe.

Bare `inline` is not ANSI C compatible, and NDK users may be using
that.

Test: treehugger
Change-Id: I82c5424522142001cd59da63ef3fd440014451ad
diff --git a/libc/include/bits/termios_inlines.h b/libc/include/bits/termios_inlines.h
index 702f433..a884b59 100644
--- a/libc/include/bits/termios_inlines.h
+++ b/libc/include/bits/termios_inlines.h
@@ -37,7 +37,7 @@
 #include <linux/termios.h>
 
 #if !defined(__BIONIC_TERMIOS_INLINE)
-#define __BIONIC_TERMIOS_INLINE static inline
+#define __BIONIC_TERMIOS_INLINE static __inline
 #endif
 
 __BEGIN_DECLS
@@ -45,7 +45,7 @@
 // Supporting separate input and output speeds would require an ABI
 // change for `struct termios`.
 
-static inline speed_t cfgetspeed(const struct termios* _Nonnull s) {
+static __inline speed_t cfgetspeed(const struct termios* _Nonnull s) {
   return __BIONIC_CAST(static_cast, speed_t, s->c_cflag & CBAUD);
 }