auto merge of #5880 : Dretch/rust/signals, r=thestinger

This is a follow-up to #5761. Its purpose is to make core::libc more consistent - it currently only defines SIGKILL and SIGTERM, because they are the only values that happen to be needed by libcore.

This adds all the posix signal value constants, except for those that have different values on different architectures.

The output of the command `man 7 signal` was used to compile these signal values.

Author: bors

src/libcore/libc.rs

@@ -863,10 +863,20 @@ pub mod consts {
             pub static F_TEST : int = 3;
             pub static F_TLOCK : int = 2;
             pub static F_ULOCK : int = 0;
+            pub static SIGHUP : int = 1;
+            pub static SIGINT : int = 2;
+            pub static SIGQUIT : int = 3;
+            pub static SIGILL : int = 4;
+            pub static SIGABRT : int = 6;
+            pub static SIGFPE : int = 8;
             pub static SIGKILL : int = 9;
+            pub static SIGSEGV : int = 11;
+            pub static SIGPIPE : int = 13;
+            pub static SIGALRM : int = 14;
             pub static SIGTERM : int = 15;
         }
         pub mod posix01 {
+            pub static SIGTRAP : int = 5;
         }
         pub mod posix08 {
         }
@@ -932,10 +942,20 @@ pub mod consts {
             pub static F_TEST : int = 3;
             pub static F_TLOCK : int = 2;
             pub static F_ULOCK : int = 0;
+            pub static SIGHUP : int = 1;
+            pub static SIGINT : int = 2;
+            pub static SIGQUIT : int = 3;
+            pub static SIGILL : int = 4;
+            pub static SIGABRT : int = 6;
+            pub static SIGFPE : int = 8;
             pub static SIGKILL : int = 9;
+            pub static SIGSEGV : int = 11;
+            pub static SIGPIPE : int = 13;
+            pub static SIGALRM : int = 14;
             pub static SIGTERM : int = 15;
         }
         pub mod posix01 {
+            pub static SIGTRAP : int = 5;
         }
         pub mod posix08 {
         }
@@ -1002,10 +1022,20 @@ pub mod consts {
             pub static F_TEST : int = 3;
             pub static F_TLOCK : int = 2;
             pub static F_ULOCK : int = 0;
+            pub static SIGHUP : int = 1;
+            pub static SIGINT : int = 2;
+            pub static SIGQUIT : int = 3;
+            pub static SIGILL : int = 4;
+            pub static SIGABRT : int = 6;
+            pub static SIGFPE : int = 8;
             pub static SIGKILL : int = 9;
+            pub static SIGSEGV : int = 11;
+            pub static SIGPIPE : int = 13;
+            pub static SIGALRM : int = 14;
             pub static SIGTERM : int = 15;
         }
         pub mod posix01 {
+            pub static SIGTRAP : int = 5;
         }
         pub mod posix08 {
         }