gallium/util: move u_string.h to src/util/u_string.h

This will help us move u_queue.c here eventually and also provide
string function wrappers for anyone wishing to port disk_cache.c
to windows.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/auxiliary/Makefile.sources

@@ -290,7 +290,6 @@ C_SOURCES := \
 	util/u_simple_shaders.h \
 	util/u_split_prim.h \
 	util/u_sse.h \
-	util/u_string.h \
 	util/u_suballoc.c \
 	util/u_suballoc.h \
 	util/u_surface.c \

src/gallium/auxiliary/util/u_debug_symbol.c

@@ -34,7 +34,7 @@
 
 #include "pipe/p_compiler.h"
 #include "os/os_thread.h"
-#include "u_string.h"
+#include "util/u_string.h"
 
 #include "u_debug.h"
 #include "u_debug_symbol.h"

src/gallium/auxiliary/util/u_queue.c

@@ -26,7 +26,7 @@
 
 #include "u_queue.h"
 #include "u_memory.h"
-#include "u_string.h"
+#include "util/u_string.h"
 
 static void util_queue_killall_and_wait(struct util_queue *queue);
 

src/util/Makefile.sources

@@ -44,6 +44,7 @@ MESA_UTIL_FILES :=	\
 	texcompress_rgtc_tmp.h \
 	u_atomic.h \
 	u_endian.h \
+	u_string.h \
 	u_vector.c \
 	u_vector.h \
 	vk_alloc.h \