__warn_references: tweak assembly for "gnu.warning" section

On some targets ';' (like hppa) is treated as a comment
in assembly files. This occasionally causes the following
assembly failures:

```
Error: can't resolve `.gnu.warning.EVP_DecryptFinal'
{.gnu.warning.EVP_DecryptFinal section} - `.Ltext0' {.text section}
```

Note how branch (or other reference) attempts to cross the
boundary across two section types: '.text' and '.gnu.warning'.

Tobias Ulmer notes that openbsd already uses newlines
for similar macro:

https://github.com/openbsd/src/blob/master/sys/arch/hppa/include/cdefs.h

This change switches from ';' to newline as well.
Tested on hppa2.0 and x86_64.

Reported-by: Jeroen Roovers
Bug: https://bugs.gentoo.org/656104
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>

include/compat/sys/types.h

@@ -62,7 +62,7 @@ typedef SSIZE_T ssize_t;
 #if defined(__GNUC__)  && defined (HAS_GNU_WARNING_LONG)
 #define __warn_references(sym,msg)          \
   __asm__(".section .gnu.warning." __STRING(sym)  \
-         " ; .ascii \"" msg "\" ; .text");
+         "\n\t.ascii \"" msg "\"\n\t.text");
 #else
 #define __warn_references(sym,msg)
 #endif