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Use __NEWLIB__ instead of __SWITCH__ and __CYGWIN__ for alloca.h-detection (#3070)

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Cygwin uses newlib, so it's covered by the __NEWLIB__ check.
You can see how it defines __NEWLIB__ here: https://cygwin.com/git/?p=newlib-cygwin.git;a=blob;f=newlib/configure.in#l453
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Clownacy 2020-04-28 15:15:00 +01:00 committed by GitHub
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imgui_draw.cpp
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@ -36,7 +36,7 @@ Index of this file:
#include <stdio.h> // vsnprintf, sscanf, printf
#if !defined(alloca)
#if defined(__GLIBC__) || defined(__sun) || defined(__CYGWIN__) || defined(__APPLE__) || defined(__SWITCH__)
#if defined(__GLIBC__) || defined(__sun) || defined(__APPLE__) || defined(__NEWLIB__)
#include <alloca.h> // alloca (glibc uses <alloca.h>. Note that Cygwin may have _WIN32 defined, so the order matters here)
#elif defined(_WIN32)
#include <malloc.h> // alloca