util: Declare util_half_init_tables only once.

src/gallium/auxiliary/util/u_gctors.cpp

@@ -4,7 +4,7 @@
    __attribute__((constructor)) allows to do this in C, but is GCC-only
 */
 
-extern "C" void util_half_init_tables(void);
+#include "u_half.h"
 
 struct util_gctor_t
 {

src/gallium/auxiliary/util/u_half.c

@@ -22,9 +22,6 @@ uint32_t util_half_to_float_offset_table[64];
 uint16_t util_float_to_half_base_table[512];
 uint8_t util_float_to_half_shift_table[512];
 
-/* called by u_gctors.cpp, which defines the prototype itself */
-void util_half_init_tables(void);
-
 void util_half_init_tables(void)
 {
 	int i;

src/gallium/auxiliary/util/u_half.h

@@ -4,6 +4,12 @@
 #include "pipe/p_compiler.h"
 #include "u_math.h"
 
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
 extern uint32_t util_half_to_float_mantissa_table[2048];
 extern uint32_t util_half_to_float_exponent_table[64];
 extern uint32_t util_half_to_float_offset_table[64];
@@ -53,4 +59,12 @@ util_float_to_half(float f)
 	return util_floatui_to_half(i.ui);
 }
 
+/* called by u_gctors.cpp, which defines the prototype itself */
+void util_half_init_tables(void);
+
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* U_HALF_H */