fix -Wduplicate-decl-specifier warnings

include/iwinfo.h:209:19: warning: duplicate 'const' declaration specifier [-Wduplicate-decl-specifier]
  209 | static const char const *ht_secondary_offset[4] = {
      |                   ^~~~~

Constify and move the offenders out of the header.

Signed-off-by: Andre Heider <a.heider@gmail.com>

include/iwinfo.h

@@ -199,25 +199,15 @@ struct iwinfo_scanlist_vht_chan_entry {
 	uint8_t center_chan_2;
 };
 
-static const char *ht_secondary_offset[4] = {
+extern const char * const ht_secondary_offset[4];
-	"no secondary",
+/* 0 = 20 MHz
-	"above",
+   1 = 40 MHz or higher (refer to vht if supported) */
-	"[reserved!]",
+extern const uint16_t ht_chan_width[2];
-	"below",
+/* 0 = 40 MHz or lower (refer to ht to a more precise width)
-};
+   1 = 80 MHz
-
+   2 = 160 MHz
-
+   3 = 80+80 MHz */
-static uint16_t ht_chan_width[2] = {
+extern const uint16_t vht_chan_width[4];
-	20, /* 20 MHz */
-	2040, /* 40 MHz or higher (refer to vht if supported) */
-};
-
-static uint16_t vht_chan_width[] = {
-	[0] = 40, /* 40 MHz or lower (refer to ht to a more precise width) */
-	[1] = 80, /* 80 MHz */
-	[3] = 8080, /* 80+80 MHz */
-	[2] = 160, /* 160 MHz */
-};
 
 struct iwinfo_scanlist_entry {
 	uint8_t mac[6];

iwinfo_lib.c

@@ -78,6 +78,24 @@ const char *IWINFO_HTMODE_NAMES[] = {
 	"HE160"
 };
 
+const char * const ht_secondary_offset[4] = {
+	"no secondary",
+	"above",
+	"[reserved!]",
+	"below",
+};
+
+const uint16_t ht_chan_width[2] = {
+	20,
+	2040,
+};
+
+const uint16_t vht_chan_width[4] = {
+	40, /* 40 MHz or lower (refer to ht to a more precise width) */
+	80, /* 80 MHz */
+	160, /* 160 MHz */
+	8080, /* 80+80 MHz */
+};
 
 /*
  * ISO3166 country labels