REVIEWED: TextJoin(), convert const char ** to char**

It generates multiple issues: https://c-faq.com/ansi/constmismatch.html

src/raylib.h

@@ -1510,7 +1510,7 @@ RLAPI const char *TextFormat(const char *text, ...);
 RLAPI const char *TextSubtext(const char *text, int position, int length);                  // Get a piece of a text string
 RLAPI char *TextReplace(const char *text, const char *replace, const char *by);             // Replace text string (WARNING: memory must be freed!)
 RLAPI char *TextInsert(const char *text, const char *insert, int position);                 // Insert text in a position (WARNING: memory must be freed!)
-RLAPI char *TextJoin(const char **textList, int count, const char *delimiter);              // Join text strings with delimiter
+RLAPI char *TextJoin(char **textList, int count, const char *delimiter);                    // Join text strings with delimiter
 RLAPI char **TextSplit(const char *text, char delimiter, int *count);                       // Split text into multiple strings
 RLAPI void TextAppend(char *text, const char *append, int *position);                       // Append text at specific position and move cursor!
 RLAPI int TextFindIndex(const char *text, const char *find);                                // Find first text occurrence within a string

src/rtext.c

@@ -1629,7 +1629,7 @@ char *TextInsert(const char *text, const char *insert, int position)
 
 // Join text strings with delimiter
 // REQUIRES: memset(), memcpy()
-char *TextJoin(const char **textList, int count, const char *delimiter)
+char *TextJoin(char **textList, int count, const char *delimiter)
 {
     static char buffer[MAX_TEXT_BUFFER_LENGTH] = { 0 };
     memset(buffer, 0, MAX_TEXT_BUFFER_LENGTH);