[libc] Fix bugs found when testing with all headers (#144049)

Fixes a couple of bugs found when building. The PR to enable the headers
can be found here: #144114.

- math.yaml: float128 guard
- wchar.yaml: __restrict keyword order

Author: saturn691

libc/include/math.yaml

@@ -734,7 +734,7 @@ functions:
       - type: float128
       - type: float128
       - type: float128
-    guards: LIBC_TYPES_HAS_FLOAT128
+    guard: LIBC_TYPES_HAS_FLOAT128
   - name: ffmal
     standards:
       - stdc

libc/include/wchar.yaml

@@ -109,8 +109,8 @@ functions:
       - stdc
     return_type: wchar_t *
     arguments: 
-      - type: __restrict wchar_t *
-      - type: const __restrict wchar_t *
+      - type: wchar_t *__restrict 
+      - type: const wchar_t *__restrict
       - type: size_t
   - name: wmemmove
     standards:
@@ -125,16 +125,16 @@ functions:
       - stdc
     return_type: wchar_t *
     arguments:
-      - type: __restrict wchar_t *
-      - type: const __restrict wchar_t *
+      - type: wchar_t *__restrict
+      - type: const wchar_t *__restrict
       - type: size_t
   - name: wcscat
     standards:
       - stdc
     return_type: wchar_t *
     arguments: 
-      - type: __restrict wchar_t *
-      - type: const __restrict wchar_t *
+      - type: wchar_t *__restrict
+      - type: const wchar_t *__restrict
   - name: wcsstr
     standards:
       - stdc
@@ -147,13 +147,13 @@ functions:
       - stdc
     return_type: wchar_t *
     arguments:
-      - type: __restrict wchar_t *
-      - type: const __restrict wchar_t *
+      - type: wchar_t *__restrict
+      - type: const wchar_t *__restrict
       - type: size_t
   - name: wcscpy
     standards:
       - stdc
     return_type: wchar_t *
     arguments:
-      - type: __restrict wchar_t *
-      - type: const __restrict wchar_t *
+      - type: wchar_t *__restrict
+      - type: const wchar_t *__restrict

libc/test/src/stdio/printf_core/converter_test.cpp

@@ -124,7 +124,7 @@ TEST_F(LlvmLibcPrintfConverterTest, StringConversionSimple) {
 TEST_F(LlvmLibcPrintfConverterTest, StringConversionPrecisionHigh) {
   LIBC_NAMESPACE::printf_core::FormatSection high_precision_conv;
   high_precision_conv.has_conv = true;
-  high_precision_conv.raw_string = "%4s";
+  high_precision_conv.raw_string = "%.4s";
   high_precision_conv.conv_name = 's';
   high_precision_conv.precision = 4;
   high_precision_conv.conv_val_ptr = const_cast<char *>("456");