Use one libc wrapper copy for sgx and other platforms (#107)

And remove bh_printf macro for other platform header files

core/shared-lib/platform/alios/bh_platform.h

@@ -52,8 +52,6 @@ typedef int64_t int64;
 #define wa_free bh_free
 #define wa_strdup bh_strdup
 
-#define bh_printf printf
-
 typedef aos_task_t korp_thread;
 typedef korp_thread *korp_tid;
 typedef aos_task_t *aos_tid_t;

core/shared-lib/platform/linux-sgx/bh_platform.c

@@ -52,7 +52,7 @@ void bh_set_print_function(bh_print_function_t pf)
     print_function = pf;
 }
 
-int bh_printf(const char *message, ...)
+int bh_printf_sgx(const char *message, ...)
 {
     if (print_function != NULL) {
         char msg[FIXED_BUFFER_SIZE] = { '\0' };

core/shared-lib/platform/linux-sgx/bh_platform.h

@@ -38,7 +38,7 @@
 extern "C" {
 #endif
 
-extern int bh_printf(const char *message, ...);
+extern int bh_printf_sgx(const char *message, ...);
 
 typedef uint64_t uint64;
 typedef int64_t int64;

core/shared-lib/platform/linux/bh_platform.h

@@ -77,8 +77,6 @@ typedef void* (*thread_start_routine_t)(void*);
 #define wa_free bh_free
 #define wa_strdup bh_strdup
 
-#define bh_printf printf
-
 int snprintf(char *buffer, size_t count, const char *format, ...);
 double fmod(double x, double y);
 float fmodf(float x, float y);

core/shared-lib/platform/vxworks/bh_platform.h

@@ -75,8 +75,6 @@ typedef void* (*thread_start_routine_t)(void*);
 #define wa_free bh_free
 #define wa_strdup bh_strdup
 
-#define bh_printf printf
-
 int snprintf(char *buffer, size_t count, const char *format, ...);
 double fmod(double x, double y);
 float fmodf(float x, float y);

core/shared-lib/platform/zephyr/bh_platform.h

@@ -78,8 +78,6 @@ typedef void* (*thread_start_routine_t)(void*);
 #define wa_malloc bh_malloc
 #define wa_free bh_free
 
-#define bh_printf printf
-
 /* Unit test framework is based on C++, where the declaration of
  snprintf is different.  */
 #ifndef __cplusplus