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Abort with appropriate message if first call of mmap fails with EPERM
(fix of commit 1c62b365b)

This is observed on Linux, at least.

* os_dep.c [!OS2 && !PCR && !AMIGA && !USE_WINALLOC && !MACOS
&& !DOS4GW && !NINTENDO_SWITCH && !NONSTOP && !SN_TARGET_ORBIS
&& !SN_TARGET_PS3 && !SN_TARGET_PSP2 && !RTEMS && !__CC_ARM
&& MMAP_SUPPORTED && !MSWIN_XBOX1] (GC_unix_mmap_get_mem): Call ABORT()
if allocation failed and GC_pages_executable and last_addr==HEAP_START
and errno is EPERM.

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