fix(query): fix syntax errors on centos.

include/os/osMemory.h

@@ -39,7 +39,7 @@ int32_t taosMemoryDbgInitRestore();
 void   *taosMemoryMalloc(int64_t size);
 void   *taosMemoryCalloc(int64_t num, int64_t size);
 void   *taosMemoryRealloc(void *ptr, int64_t size);
-void   *taosStrdup(const char *ptr);
+char   *taosStrdup(const char *ptr);
 void    taosMemoryFree(void *ptr);
 int64_t taosMemorySize(void *ptr);
 void    taosPrintBackTrace();

source/os/src/osMemory.c

@@ -312,7 +312,7 @@ void *taosMemoryRealloc(void *ptr, int64_t size) {
 #endif
 }
 
-void *taosStrdup(const char *ptr) {
+char *taosStrdup(const char *ptr) {
 #ifdef USE_TD_MEMORY
   if (ptr == NULL) return NULL;