Adding ipc_ prefix to ipc primitives

* Also change _orig to _intr for clarity
 * Cleaned up {IPC,KER}VEC
 * Renamed _minix_kernel_info_struct to get_minix_kerninfo
 * Merged _senda.S into _ipc.S
 * Moved into separate files get_minix_kerninfo and _do_kernel_call
 * Adapted do_kernel_call to follow same _ convention as ipc functions
 * Drop patches in libc/net/send.c and libc/include/namespace.h

Change-Id: If4ea21ecb65435170d7d87de6c826328e84c18d0

kernel/arch/earm/mpx.S

@@ -177,9 +177,9 @@ ENTRY(svc_entry)
 	/* save the pointer to the current process */
 	ldr	fp, [sp]
 
-	cmp	r3, #KERVEC
+	cmp	r3, #KERVEC_INTR
 	beq	kernel_call_entry
-	cmp	r3, #IPCVEC
+	cmp	r3, #IPCVEC_INTR
 	beq	ipc_entry
 
 	/* return -1 to the current process as an invalid SWI was called .*/

kernel/arch/i386/mpx.S

@@ -29,6 +29,7 @@
 #include "kernel/kernel.h"
 #include <minix/config.h>
 #include <minix/const.h>
+#include <minix/ipcconst.h>
 #include <minix/com.h>
 #include <machine/asm.h>
 #include <machine/interrupt.h>

kernel/proc.h

@@ -178,7 +178,7 @@ struct proc {
 /* Macro to return: on which process is a certain process blocked?
  * return endpoint number (can be ANY) or NONE. It's important to
  * check RTS_SENDING first, and then RTS_RECEIVING, as they could
- * both be on (if a sendrec() blocks on sending), and p_getfrom_e
+ * both be on (if a ipc_sendrec() blocks on sending), and p_getfrom_e
  * could be nonsense even though RTS_RECEIVING is on.
  */
 #define P_BLOCKEDON(p)							\