Use ifunc to dynamically dispatch libc routines for x86

Test: run bionic unit test in aosp_cf_x86_phone emulator
Change-Id: Ib0c0de37cd38d24bfce2dfbe35b8fd8edff004af
diff --git a/libc/arch-x86/atom/string/ssse3-wcscpy-atom.S b/libc/arch-x86/atom/string/ssse3-wcscpy-atom.S
index 27cb61e..80aa15f 100644
--- a/libc/arch-x86/atom/string/ssse3-wcscpy-atom.S
+++ b/libc/arch-x86/atom/string/ssse3-wcscpy-atom.S
@@ -88,7 +88,7 @@
 # define LEN	STR2+4
 
 .text
-ENTRY (wcscpy)
+ENTRY (wcscpy_ssse3)
 	mov	STR1(%esp), %edx
 	mov	STR2(%esp), %ecx
 
@@ -648,5 +648,5 @@
 	ret
 
 #ifndef USE_AS_WCSCAT
-END (wcscpy)
+END (wcscpy_ssse3)
 #endif