libm: stop exporting __muldc3

Bug: http://b/26004493
Change-Id: I991268d5e7b59bca646da25d0ad90a1cb4a9d4b9
diff --git a/libm/libm.mips.map b/libm/libm.mips.map
index 78ed1ea..476c6ad 100644
--- a/libm/libm.mips.map
+++ b/libm/libm.mips.map
@@ -272,11 +272,10 @@
     *;
 };
 
-LIBC_PRIVATE { # arm x86 mips
-  global: # arm x86 mips
+LIBC_PRIVATE { # arm mips
+  global: # arm mips
     __fixdfdi; # arm mips
     __fixsfdi; # arm mips
     __fixunsdfdi; # arm mips
     __fixunssfdi; # arm mips
-    __muldc3; # arm x86 mips
-} LIBC; # arm x86 mips
+} LIBC; # arm mips