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

sys/arch/arm/include/asm.h

@@ -92,8 +92,8 @@
 #define _LABEL(x) \
 	.globl x; x:
 #define	LABEL(y)	_LABEL(_C_LABEL(y))
-
 #endif /* defined(__minix) */
+
 #define	ASMSTR		.asciz
 
 #if defined(PIC)

sys/arch/i386/include/asm.h

@@ -218,13 +218,6 @@
 #ifdef __minix
 #define IMPORT(sym)               \
         .extern _C_LABEL(sym)
-
-#define KERVEC_ORIG 32     /* syscall trap to kernel */
-#define IPCVEC_ORIG 33     /* ipc trap to kernel  */
-
-#define KERVEC_UM 34     /* syscall trap to kernel, user-mapped code */
-#define IPCVEC_UM 35     /* ipc trap to kernel, user-mapped code  */
-
 #endif
 
 #endif /* !_I386_ASM_H_ */