Support long double intrinsics in any aarch64 linux

Expands the support added in rust-lang#377 from just musl to any linux.

Fixes rust-lang#428

Author: richkadel

build.rs

@@ -419,6 +419,11 @@ mod c {
                 ("__floatunsitf", "floatunsitf.c"),
                 ("__trunctfdf2", "trunctfdf2.c"),
                 ("__trunctfsf2", "trunctfsf2.c"),
+                ("__addtf3", "addtf3.c"),
+                ("__multf3", "multf3.c"),
+                ("__subtf3", "subtf3.c"),
+                ("__divtf3", "divtf3.c"),
+                ("__powitf2", "powitf2.c"),
             ]);
 
             if target_os != "windows" {
@@ -427,11 +432,6 @@ mod c {
 
             if target_env == "musl" {
                 sources.extend(&[
-                    ("__addtf3", "addtf3.c"),
-                    ("__multf3", "multf3.c"),
-                    ("__subtf3", "subtf3.c"),
-                    ("__divtf3", "divtf3.c"),
-                    ("__powitf2", "powitf2.c"),
                     ("__fe_getround", "fp_mode.c"),
                     ("__fe_raise_inexact", "fp_mode.c"),
                 ]);