[libc] fix up strings.h entrypoints (#119417)

I typo'd riscv, and the newly added baremetal aarch64 entrypoints had a mid air
collision.

Link: #118691
Link: #118899

Author: nickdesaulniers

libc/config/baremetal/aarch64/entrypoints.txt

@@ -31,10 +31,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.setjmp.setjmp
 
     # string.h entrypoints
-    libc.src.string.bcmp
-    libc.src.string.bcopy
-    libc.src.string.bzero
-    libc.src.string.index
     libc.src.string.memccpy
     libc.src.string.memchr
     libc.src.string.memcmp
@@ -45,10 +41,8 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.string.memrchr
     libc.src.string.memset
     libc.src.string.memset_explicit
-    libc.src.string.rindex
     libc.src.string.stpcpy
     libc.src.string.stpncpy
-    libc.src.string.strcasecmp
     libc.src.string.strcasestr
     libc.src.string.strcat
     libc.src.string.strchr
@@ -62,7 +56,6 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.string.strlcat
     libc.src.string.strlcpy
     libc.src.string.strlen
-    libc.src.string.strncasecmp
     libc.src.string.strncat
     libc.src.string.strncmp
     libc.src.string.strncpy
@@ -76,6 +69,15 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.string.strtok_r
     libc.src.string.strxfrm
 
+    # strings.h entrypoints
+    libc.src.strings.bcmp
+    libc.src.strings.bcopy
+    libc.src.strings.bzero
+    libc.src.strings.index
+    libc.src.strings.rindex
+    libc.src.strings.strcasecmp
+    libc.src.strings.strncasecmp
+
     # inttypes.h entrypoints
     libc.src.inttypes.imaxabs
     libc.src.inttypes.imaxdiv

libc/config/linux/riscv/entrypoints.txt

@@ -87,8 +87,8 @@ set(TARGET_LIBC_ENTRYPOINTS
     libc.src.string.strxfrm
 
     # strings.h entrypoints
-    libc.src.string.index
-    libc.src.string.rindex
+    libc.src.strings.index
+    libc.src.strings.rindex
     libc.src.strings.bcmp
     libc.src.strings.bcopy
     libc.src.strings.bzero