fortify: inline #defined strings

These were originally #defined so we could share them between our
GCC and clang FORTIFY implementations. Since we no longer have a GCC
FORTIFY, #defining them is sort of pointless.

Bug: 131861088
Test: mma
Change-Id: I2ae4e0bdebbed16c946f5df7cc38c471881b481e
diff --git a/libc/include/bits/fortify/stdlib.h b/libc/include/bits/fortify/stdlib.h
index eff909f..0bb3d0d 100644
--- a/libc/include/bits/fortify/stdlib.h
+++ b/libc/include/bits/fortify/stdlib.h
@@ -31,18 +31,16 @@
 #endif
 
 #if defined(__BIONIC_FORTIFY)
-#define __realpath_buf_too_small_str \
-    "'realpath' output parameter must be NULL or a pointer to a buffer with >= PATH_MAX bytes"
 
 /* PATH_MAX is unavailable without polluting the namespace, but it's always 4096 on Linux */
 #define __PATH_MAX 4096
 
 char* realpath(const char* path, char* resolved)
         __clang_error_if(__bos_unevaluated_lt(__bos(resolved), __PATH_MAX),
-                         __realpath_buf_too_small_str)
+                         "'realpath' output parameter must be NULL or a pointer to a buffer "
+                         "with >= PATH_MAX bytes")
         __clang_error_if(!path, "'realpath': NULL path is never correct; flipped arguments?");
 /* No need for a definition; the only issues we can catch are at compile-time. */
 
 #undef __PATH_MAX
-#undef __realpath_buf_too_small_str
 #endif /* defined(__BIONIC_FORTIFY) */