Remove internal header from CLI veneer

Source/astcenccli_entry.cpp

@@ -22,7 +22,19 @@
  * validating the host extended ISA support meets the needs of the tools.
  */
 
-#include "astcenccli_internal.h"
+#include <cstdio>
+
+/**
+ * @brief The main entry point.
+ *
+ * @param argc   The number of arguments.
+ * @param argv   The vector of arguments.
+ *
+ * @return 0 on success, non-zero otherwise.
+ */
+int astcenc_main(
+	int argc,
+	char **argv);
 
 #if (ASTCENC_SSE > 20)    || (ASTCENC_AVX > 0) || \
     (ASTCENC_POPCNT > 0) || (ASTCENC_F16C > 0)
@@ -186,6 +198,15 @@ static bool cpu_supports_avx2()
 }
 #endif
 
+/**
+ * @brief Print a string to stderr.
+ */
+static inline void print_error(
+	const char* format
+) {
+	fprintf(stderr, "%s", format);
+}
+
 /**
  * @brief Validate CPU ISA support meets the requirements of this build of the library.
  *

Source/astcenccli_internal.h

@@ -395,16 +395,4 @@ void launch_threads(
 	void (*func)(int, int, void*),
 	void *payload);
 
-/**
- * @brief The main entry point.
- *
- * @param argc   The number of arguments.
- * @param argv   The vector of arguments.
- *
- * @return 0 on success, non-zero otherwise.
- */
-int astcenc_main(
-	int argc,
-	char **argv);
-
 #endif