Document BUILD_EXAMPLES makefile variable

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109346 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/docs/MakefileGuide.html b/docs/MakefileGuide.html
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@@ -785,6 +785,9 @@
     not.</dd>
     <dt><a name="PROJ_SRC_DIR"><tt>PROJ_SRC_DIR</tt></a></dt>
     <dd>The directory which contains the source files to be built.</dd>
+    <dt><a name="BUILD_EXAMPLES"><tt>BUILD_EXAMPLES</tt></a></dt>
+    <dd>If set to 1, build examples in <tt>examples</tt> and (if building
+    Clang) <tt>tools/clang/examples</tt> directories.</dd>
     <dt><a name="BZIP2"><tt>BZIP2</tt></a><small>(configured)</small></dt>
     <dd>The path to the <tt>bzip2</tt> tool.</dd>
     <dt><a name="CC"><tt>CC</tt></a><small>(configured)</small></dt>