Fix syscall wrapper naming mismatch

Syscall wrapper implementations used long names while header
generated short names via macro, causing link errors when
user code called the declared wrappers.

Rename implementations to match macro-generated short names,
following POSIX conventions for syscall interfaces.

Author: HeatCrab

kernel/syscall.c

@@ -239,7 +239,7 @@ static int _tadd(void *task, int stack_size)
     return mo_task_spawn(task, stack_size);
 }
 
-int sys_task_add(void *task, int stack_size)
+int sys_tadd(void *task, int stack_size)
 {
     return syscall(SYS_tadd, task, (void *) stack_size, 0);
 }
@@ -252,7 +252,7 @@ static int _tcancel(int id)
     return mo_task_cancel(id);
 }
 
-int sys_task_cancel(int id)
+int sys_tcancel(int id)
 {
     return syscall(SYS_tcancel, (void *) id, 0, 0);
 }
@@ -263,7 +263,7 @@ static int _tyield(void)
     return 0;
 }
 
-int sys_task_yield(void)
+int sys_tyield(void)
 {
     return syscall(SYS_tyield, 0, 0, 0);
 }
@@ -277,7 +277,7 @@ static int _tdelay(int ticks)
     return 0;
 }
 
-int sys_task_delay(int ticks)
+int sys_tdelay(int ticks)
 {
     return syscall(SYS_tdelay, (void *) ticks, 0, 0);
 }
@@ -290,7 +290,7 @@ static int _tsuspend(int id)
     return mo_task_suspend(id);
 }
 
-int sys_task_suspend(int id)
+int sys_tsuspend(int id)
 {
     return syscall(SYS_tsuspend, (void *) id, 0, 0);
 }
@@ -303,7 +303,7 @@ static int _tresume(int id)
     return mo_task_resume(id);
 }
 
-int sys_task_resume(int id)
+int sys_tresume(int id)
 {
     return syscall(SYS_tresume, (void *) id, 0, 0);
 }
@@ -316,7 +316,7 @@ static int _tpriority(int id, int priority)
     return mo_task_priority(id, priority);
 }
 
-int sys_task_priority(int id, int priority)
+int sys_tpriority(int id, int priority)
 {
     return syscall(SYS_tpriority, (void *) id, (void *) priority, 0);
 }
@@ -326,7 +326,7 @@ static int _tid(void)
     return mo_task_id();
 }
 
-int sys_task_id(void)
+int sys_tid(void)
 {
     return syscall(SYS_tid, 0, 0, 0);
 }
@@ -337,7 +337,7 @@ static int _twfi(void)
     return 0;
 }
 
-int sys_task_wfi(void)
+int sys_twfi(void)
 {
     return syscall(SYS_twfi, 0, 0, 0);
 }
@@ -347,7 +347,7 @@ static int _tcount(void)
     return mo_task_count();
 }
 
-int sys_task_count(void)
+int sys_tcount(void)
 {
     return syscall(SYS_tcount, 0, 0, 0);
 }