Clean up includes a bit

Trying out the IWYU tool to only include what's necessary in a given file.
Seems to work decently (it'll miss some headers, suggest unnecessary ones, and
make nonsense suggestions for some things, but overall gives a good starting
point), and helps clean out some headers.

1 files changed, 9 insertions, 12 deletions

diff --git a/Alc/bformatdec.cpp b/Alc/bformatdec.cpp
index 6ef398ec..889bbf3a 100644
--- a/Alc/bformatdec.cpp
+++ b/Alc/bformatdec.cpp
@@ -1,27 +1,24 @@
 
 #include "config.h"
 
-#include <cmath>
+#include "bformatdec.h"
+
+#include <algorithm>
 #include <array>
-#include <vector>
+#include <cassert>
+#include <cmath>
+#include <iterator>
 #include <numeric>
-#include <algorithm>
-#include <functional>
 
-#include "bformatdec.h"
+#include "almalloc.h"
+#include "alu.h"
 #include "ambdec.h"
 #include "filters/splitter.h"
-#include "alu.h"
-
-#include "threads.h"
-#include "almalloc.h"
+#include "opthelpers.h"
 
 
 namespace {
 
-using namespace std::placeholders;
-
-
 constexpr ALfloat Ambi3DDecoderHFScale[MAX_AMBI_ORDER+1] = {
     1.00000000e+00f, 1.00000000e+00f
 };