erofs-utils: fix compilation error due to const static init

gcc-7 and earlier versions fail to infer the initial value of a
const global variable from another const global variable.  Therefore,
compiling with gcc-7 and below will result in failure.  In fact, for
global const variables, using macros is a better choice.

Signed-off-by: Li Yiyan <lyy0627@sjtu.edu.cn>
Link: https://lore.kernel.org/r/20230725085020.904884-1-lyy0627@sjtu.edu.cn
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

lib/kite_deflate.c

@@ -47,6 +47,11 @@ unsigned long erofs_memcmp2(const u8 *s1, const u8 *s2,
 #define kMatchMinLen		3
 #define kMatchMaxLen32		kNumLenSymbols32 + kMatchMinLen - 1
 
+#define kTableDirectLevels      16
+#define kBitLensRepNumber_3_6   kTableDirectLevels
+#define kBitLens0Number_3_10    (kBitLensRepNumber_3_6 + 1)
+#define kBitLens0Number_11_138  (kBitLens0Number_3_10 + 1)
+
 static u32 kstaticHuff_mainCodes[kFixedLenTableSize];
 static const u8 kstaticHuff_litLenLevels[kFixedLenTableSize] = {
 	[0   ... 143] = 8, [144 ... 255] = 9,
@@ -75,11 +80,6 @@ const u8 kCodeLengthAlphabetOrder[kLensTableSize] =
 
 const u8 kLevelExtraBits[3] = {2, 3, 7};
 
-const unsigned int kTableDirectLevels = 16;
-const unsigned int kBitLensRepNumber_3_6 = kTableDirectLevels;
-const unsigned int kBitLens0Number_3_10 = kBitLensRepNumber_3_6 + 1;
-const unsigned int kBitLens0Number_11_138 = kBitLens0Number_3_10 + 1;
-
 #define kStored			0
 #define kFixedHuffman		1
 #define kDynamicHuffman		2