remove unnecessary extern "C" blocks

A handful of header files in QEMU are wrapped with extern "C" blocks.
These are not necessary: there are C++ source files anymore in QEMU,
and even where there were some, they did not include most of these
files anyway.

Remove them for consistency.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/disas/dis-asm.h

@@ -11,10 +11,6 @@
 
 #include "qemu/bswap.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 typedef void *PTR;
 typedef uint64_t bfd_vma;
 typedef int64_t bfd_signed_vma;
@@ -506,8 +502,4 @@ static inline bfd_vma bfd_getb16(const bfd_byte *addr)
 
 typedef bool bfd_boolean;
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif /* DISAS_DIS_ASM_H */

include/qemu/bswap.h

@@ -1,10 +1,6 @@
 #ifndef BSWAP_H
 #define BSWAP_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #undef  bswap16
 #define bswap16(_x) __builtin_bswap16(_x)
 #undef  bswap32
@@ -395,8 +391,4 @@ DO_STN_LDN_P(be)
 #undef le_bswaps
 #undef be_bswaps
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif /* BSWAP_H */

include/qemu/envlist.h

@@ -1,10 +1,6 @@
 #ifndef ENVLIST_H
 #define ENVLIST_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 typedef struct envlist envlist_t;
 
 envlist_t *envlist_create(void);
@@ -15,8 +11,4 @@ int envlist_parse_set(envlist_t *, const char *);
 int envlist_parse_unset(envlist_t *, const char *);
 char **envlist_to_environ(const envlist_t *, size_t *);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif /* ENVLIST_H */

include/qemu/rcu.h

@@ -31,10 +31,6 @@
 #include "qemu/sys_membarrier.h"
 #include "qemu/coroutine-tls.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /*
  * Important !
  *
@@ -196,8 +192,4 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(RCUReadAuto, rcu_read_auto_unlock)
 void rcu_add_force_rcu_notifier(Notifier *n);
 void rcu_remove_force_rcu_notifier(Notifier *n);
 
-#ifdef __cplusplus
-}
-#endif
-
 #endif /* QEMU_RCU_H */

include/qemu/rcu_queue.h

@@ -28,11 +28,6 @@
 #include "qemu/queue.h"
 #include "qemu/atomic.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
 /*
  * List access methods.
  */
@@ -311,7 +306,4 @@ extern "C" {
          (var) && ((next) = qatomic_rcu_read(&(var)->field.sle_next), 1); \
          (var) = (next))
 
-#ifdef __cplusplus
-}
-#endif
 #endif /* QEMU_RCU_QUEUE_H */

include/qemu/uri.h

@@ -53,10 +53,6 @@
 #ifndef QEMU_URI_H
 #define QEMU_URI_H
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /**
  * URI:
  *
@@ -105,7 +101,4 @@ struct QueryParams *query_params_new (int init_alloc);
 extern QueryParams *query_params_parse (const char *query);
 extern void query_params_free (QueryParams *ps);
 
-#ifdef __cplusplus
-}
-#endif
 #endif /* QEMU_URI_H */