clang: Add back C_INCLUDE_DIRS (fixes #683)

packages/clang/build.sh

@@ -2,7 +2,7 @@ TERMUX_PKG_HOMEPAGE=http://clang.llvm.org/
 TERMUX_PKG_DESCRIPTION="C and C++ frontend for the LLVM compiler"
 _PKG_MAJOR_VERSION=3.9
 TERMUX_PKG_VERSION=${_PKG_MAJOR_VERSION}.1
-TERMUX_PKG_REVISION=1
+TERMUX_PKG_REVISION=2
 TERMUX_PKG_SRCURL=http://llvm.org/releases/${TERMUX_PKG_VERSION}/llvm-${TERMUX_PKG_VERSION}.src.tar.xz
 TERMUX_PKG_SHA256=1fd90354b9cf19232e8f168faf2220e79be555df3aa743242700879e8fd329ee
 TERMUX_PKG_HOSTBUILD=true
@@ -23,6 +23,7 @@ TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
 -DLLVM_INCLUDE_TESTS=OFF
 -DCLANG_INCLUDE_TESTS=OFF
 -DCLANG_TOOL_C_INDEX_TEST_BUILD=OFF
+-DC_INCLUDE_DIRS=$TERMUX_PREFIX/include
 -DBUILD_SHARED_LIBS=ON
 -DPYTHON_EXECUTABLE=`which python2.7`
 -DLLVM_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/llvm-tblgen