[libc] Add ctype.h locale variants (#102711)

Summary:
This patch adds all the libc ctype variants. These ignore the locale
ingormation completely, so they're pretty much just stubs. Because these
use locale information, which is system scope, we do not enable building
them outisde of full build mode.

Author: jhuber6

libc/config/gpu/entrypoints.txt

@@ -4,21 +4,35 @@ set(TARGET_LIBC_ENTRYPOINTS
 
     # ctype.h entrypoints
     libc.src.ctype.isalnum
+    libc.src.ctype.isalnum_l
     libc.src.ctype.isalpha
+    libc.src.ctype.isalpha_l
     libc.src.ctype.isascii
     libc.src.ctype.isblank
+    libc.src.ctype.isblank_l
     libc.src.ctype.iscntrl
+    libc.src.ctype.iscntrl_l
     libc.src.ctype.isdigit
+    libc.src.ctype.isdigit_l
     libc.src.ctype.isgraph
+    libc.src.ctype.isgraph_l
     libc.src.ctype.islower
+    libc.src.ctype.islower_l
     libc.src.ctype.isprint
+    libc.src.ctype.isprint_l
     libc.src.ctype.ispunct
+    libc.src.ctype.ispunct_l
     libc.src.ctype.isspace
+    libc.src.ctype.isspace_l
     libc.src.ctype.isupper
+    libc.src.ctype.isupper_l
     libc.src.ctype.isxdigit
+    libc.src.ctype.isxdigit_l
     libc.src.ctype.toascii
     libc.src.ctype.tolower
+    libc.src.ctype.tolower_l
     libc.src.ctype.toupper
+    libc.src.ctype.toupper_l
 
     # string.h entrypoints
     libc.src.string.bcmp

libc/config/linux/x86_64/entrypoints.txt

@@ -782,6 +782,22 @@ endif()
 
 if(LLVM_LIBC_FULL_BUILD)
   list(APPEND TARGET_LIBC_ENTRYPOINTS
+    # ctype.h entrypoints
+    libc.src.ctype.isalnum_l
+    libc.src.ctype.isalpha_l
+    libc.src.ctype.isblank_l
+    libc.src.ctype.iscntrl_l
+    libc.src.ctype.isdigit_l
+    libc.src.ctype.isgraph_l
+    libc.src.ctype.islower_l
+    libc.src.ctype.isprint_l
+    libc.src.ctype.ispunct_l
+    libc.src.ctype.isspace_l
+    libc.src.ctype.isupper_l
+    libc.src.ctype.isxdigit_l
+    libc.src.ctype.tolower_l
+    libc.src.ctype.toupper_l
+
     # assert.h entrypoints
     libc.src.assert.__assert_fail