libc: simplify ssse3 detection

Since ssse3 is required as part of Android's ABI, even for 32-bit x86
(https://developer.android.com/ndk/guides/abis#sa), we can simplify
these ifuncs away.

Bug: 358360849
Test: mma
Change-Id: Ife68c7f492cc1b179aa332c12ab35b2ad6b9795a
diff --git a/libc/arch-x86/string/ssse3-wcscpy-atom.S b/libc/arch-x86/string/ssse3-wcscpy-atom.S
index 80aa15f..27cb61e 100644
--- a/libc/arch-x86/string/ssse3-wcscpy-atom.S
+++ b/libc/arch-x86/string/ssse3-wcscpy-atom.S
@@ -88,7 +88,7 @@
 # define LEN	STR2+4
 
 .text
-ENTRY (wcscpy_ssse3)
+ENTRY (wcscpy)
 	mov	STR1(%esp), %edx
 	mov	STR2(%esp), %ecx
 
@@ -648,5 +648,5 @@
 	ret
 
 #ifndef USE_AS_WCSCAT
-END (wcscpy_ssse3)
+END (wcscpy)
 #endif