[PATCH] Include <array> in ui-style.h

[Nikita.Venkatesh@arm.com]

From: Nikita Venkatesh <Nikita.Venkatesh@arm.com>

ui-style.h uses std::array without including <array> directly.

This builds successfully with GCC 8 and libstdc++ as its <tuple> header
includes <array>. However, libc++'s <tuple> does not include <array> with
Apple Clang 13.0.0. This causes the GDB builds to fail on macOS with:

	error: implicit instantiation of undefined template
	'std::array<unsigned char, 3>'

Include <array> directly in ui-style.h rather than relying on the
include from <tuple>.

OK for trunk and gdb-18 branch?
---
 gdb/ui-style.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gdb/ui-style.h b/gdb/ui-style.h
index fc40b93709d..201a6f302d9 100644
--- a/gdb/ui-style.h
+++ b/gdb/ui-style.h
@@ -19,6 +19,8 @@
 #ifndef GDB_UI_STYLE_H
 #define GDB_UI_STYLE_H
 
+#include <array>
+
 /* One of the color spaces that usually supported by terminals.  */
 enum class color_space
 {
-- 
2.34.1