minor cleanup for watcom _inline keyword.

include/SDL_atomic.h

@@ -152,7 +152,7 @@ void _ReadWriteBarrier(void);
 /* This is correct for all CPUs when using GCC or Solaris Studio 12.1+. */
 #define SDL_CompilerBarrier()   __asm__ __volatile__ ("" : : : "memory")
 #elif defined(__WATCOMC__)
-extern _inline void SDL_CompilerBarrier (void);
+extern __inline void SDL_CompilerBarrier(void);
 #pragma aux SDL_CompilerBarrier = "" parm [] modify exact [];
 #else
 #define SDL_CompilerBarrier()   \

include/SDL_bits.h

@@ -48,7 +48,7 @@ extern "C" {
  *  \return the index of the most significant bit, or -1 if the value is 0.
  */
 #if defined(__WATCOMC__) && defined(__386__)
-extern _inline int _SDL_bsr_watcom (Uint32);
+extern __inline int _SDL_bsr_watcom(Uint32);
 #pragma aux _SDL_bsr_watcom = \
     "bsr eax, eax" \
     parm [eax] nomemory \

include/SDL_endian.h

@@ -150,7 +150,7 @@ SDL_Swap16(Uint16 x)
     return x;
 }
 #elif defined(__WATCOMC__) && defined(__386__)
-extern _inline Uint16 SDL_Swap16(Uint16);
+extern __inline Uint16 SDL_Swap16(Uint16);
 #pragma aux SDL_Swap16 = \
   "xchg al, ah" \
   parm   [ax]   \
@@ -208,7 +208,7 @@ SDL_Swap32(Uint32 x)
     return x;
 }
 #elif defined(__WATCOMC__) && defined(__386__)
-extern _inline Uint32 SDL_Swap32(Uint32);
+extern __inline Uint32 SDL_Swap32(Uint32);
 #pragma aux SDL_Swap32 = \
   "bswap eax"  \
   parm   [eax] \
@@ -251,7 +251,7 @@ SDL_Swap64(Uint64 x)
     return x;
 }
 #elif defined(__WATCOMC__) && defined(__386__)
-extern _inline Uint64 SDL_Swap64(Uint64);
+extern __inline Uint64 SDL_Swap64(Uint64);
 #pragma aux SDL_Swap64 = \
   "bswap eax"     \
   "bswap edx"     \

src/atomic/SDL_atomic.c

@@ -53,14 +53,14 @@
 #if defined(__WATCOMC__) && defined(__386__)
 SDL_COMPILE_TIME_ASSERT(intsize, 4==sizeof(int));
 #define HAVE_WATCOM_ATOMICS
-extern _inline int _SDL_xchg_watcom(volatile int *a, int v);
+extern __inline int _SDL_xchg_watcom(volatile int *a, int v);
 #pragma aux _SDL_xchg_watcom = \
   "lock xchg [ecx], eax" \
   parm [ecx] [eax] \
   value [eax] \
   modify exact [eax];
 
-extern _inline unsigned char _SDL_cmpxchg_watcom(volatile int *a, int newval, int oldval);
+extern __inline unsigned char _SDL_cmpxchg_watcom(volatile int *a, int newval, int oldval);
 #pragma aux _SDL_cmpxchg_watcom = \
   "lock cmpxchg [edx], ecx" \
   "setz al" \
@@ -68,7 +68,7 @@ extern _inline unsigned char _SDL_cmpxchg_watcom(volatile int *a, int newval, in
   value [al] \
   modify exact [eax];
 
-extern _inline int _SDL_xadd_watcom(volatile int *a, int v);
+extern __inline int _SDL_xadd_watcom(volatile int *a, int v);
 #pragma aux _SDL_xadd_watcom = \
   "lock xadd [ecx], eax" \
   parm [ecx] [eax] \

src/atomic/SDL_spinlock.c

@@ -42,7 +42,7 @@
 
 #if defined(__WATCOMC__) && defined(__386__)
 SDL_COMPILE_TIME_ASSERT(locksize, 4==sizeof(SDL_SpinLock));
-extern _inline int _SDL_xchg_watcom(volatile int *a, int v);
+extern __inline int _SDL_xchg_watcom(volatile int *a, int v);
 #pragma aux _SDL_xchg_watcom = \
   "lock xchg [ecx], eax" \
   parm [ecx] [eax] \
@@ -151,7 +151,7 @@ SDL_AtomicTryLock(SDL_SpinLock *lock)
     #define PAUSE_INSTRUCTION() __yield()
 #elif defined(__WATCOMC__) && defined(__386__)
     /* watcom assembler rejects PAUSE if CPU < i686, and it refuses REP NOP as an invalid combination. Hardcode the bytes.  */
-    extern _inline void PAUSE_INSTRUCTION(void);
+    extern __inline void PAUSE_INSTRUCTION(void);
     #pragma aux PAUSE_INSTRUCTION = "db 0f3h,90h"
 #else
     #define PAUSE_INSTRUCTION()