[newlib-cygwin] Support calculation of pointer size for __int20__ type in _intsup.h

[Jeff Johnston]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=301facfb60db2adb8306009ac27f3b9afd08bb5e

commit 301facfb60db2adb8306009ac27f3b9afd08bb5e
Author: Jozef Lawrynowicz <jozef.l@mittosystems.com>
Date:   Tue Jun 25 11:45:02 2019 +0100

    Support calculation of pointer size for __int20__ type in _intsup.h
    
    GCC r272640 modifies the MSP430 target to use "__int20__" for
    PTRDIFF_TYPE (and therefore INTPTR_TYPE) instead of "__int20".
    
    To support the calculation of pointer size in
    newlib/libc/include/sys/_intsup.h, definitions for __int20__ need to be
    added.

Diff:
---
 newlib/libc/include/sys/_intsup.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/newlib/libc/include/sys/_intsup.h b/newlib/libc/include/sys/_intsup.h
index 88d7400..993121b 100644
--- a/newlib/libc/include/sys/_intsup.h
+++ b/newlib/libc/include/sys/_intsup.h
@@ -37,6 +37,7 @@
 #pragma push_macro("char")
 #pragma push_macro("short")
 #pragma push_macro("__int20")
+#pragma push_macro("__int20__")
 #pragma push_macro("int")
 #pragma push_macro("long")
 #undef signed
@@ -45,12 +46,14 @@
 #undef short
 #undef int
 #undef __int20
+#undef __int20__
 #undef long
 #define signed +0
 #define unsigned +0
 #define char +0
 #define short +1
 #define __int20 +2
+#define __int20__ +2
 #define int +2
 #define long +4
 #if (__INTPTR_TYPE__ == 8 || __INTPTR_TYPE__ == 10)
@@ -189,6 +192,7 @@
 #pragma pop_macro("char")
 #pragma pop_macro("short")
 #pragma pop_macro("__int20")
+#pragma pop_macro("__int20__")
 #pragma pop_macro("int")
 #pragma pop_macro("long")