[monodroid] Fix heap overflow detected by a clang sanitizer (dotnet#6435

)

Context: dotnet#6420 (comment)

Clang's AddressSanitizer detected the following:

	Mono.Android_Tests: ==2488==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x8a600774 at pc 0xaeee9982 bp 0xbf98dc68 sp 0xbf98dc60
	Mono.Android_Tests: WRITE of size 4 at 0x8a600774 thread T0
	Mono.Android_Tests:     #0 0xaeee9981  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38981)
	Mono.Android_Tests:     #1 0xaeef92d9  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x482d9)
	Mono.Android_Tests:     #2 0xaef009ae  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x4f9ae)
	Mono.Android_Tests:     dotnet#3 0xaef06d14  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x55d14)
	Mono.Android_Tests: 0x8a600774 is located 0 bytes to the right of 4-byte region [0x8a600770,0x8a600774)
	Mono.Android_Tests: allocated by thread T0 here:
	Mono.Android_Tests:     #0 0xaedbe925  (/data/app/Mono.Android_Tests-1/lib/x86/libclang_rt.asan-i686-android.so+0xb6925)
	Mono.Android_Tests:     #1 0xaeee9ae1  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38ae1)
	Mono.Android_Tests:     #2 0xaeee9751  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38751)
	Mono.Android_Tests:     dotnet#3 0xaeef92d9  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x482d9)
	Mono.Android_Tests:     dotnet#4 0xaef009ae  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x4f9ae)
	Mono.Android_Tests:     dotnet#5 0xaef06d14  (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x55d14)
	Mono.Android_Tests:     dotnet#6 0xb30cb970  (/data/dalvik-cache/x86/data@[email protected][email protected]@classes.dex+0x5c970)
	Mono.Android_Tests: SUMMARY: AddressSanitizer: heap-buffer-overflow (/data/app/Mono.Android_Tests-1/lib/x86/libmonodroid.so+0x38981)

Address of the offending region points to
`BasicUtilities::monodroid_strsplit()` and is likely the line
modified in this commit.  Append terminating `nullptr` to `vector`
instead of overwriting the last element.

src/monodroid/jni/basic-utilities.cc

@@ -344,7 +344,7 @@ BasicUtilities::monodroid_strsplit (const char *str, const char *delimiter, size
 		vector = (char **) xmalloc (2 * sizeof (vector));
 		vector [0] = nullptr;
 	} else if (size > 0) {
-		vector[size - 1] = nullptr;
+		add_to_vector (&vector, size, nullptr);
 	}
 
 	return vector;