configure: Remove check for C++ compiler.

This should have been removed when all cpp files were converted to c.

Signed-off-by: Philip Tricca <philip.b.tricca@intel.com>
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9cea2f0..3b987b0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 - Library for marshaling TPM2 types: libmarshal.
 - Unit test for device TCTI bug fixes.
 ### Changed
+- Converted all cpp files to c, removed dependency on C++ compiler.
 - Cleaned out a number of marshaling functions from the SAPI code. Things
 required by the resource manager were removed from libsapi and moved into
 the 'common directory.
diff --git a/configure.ac b/configure.ac
index ea6c5fa..5b97a51 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,7 +5,6 @@
 AC_INIT([tpm2.0-tss], [tpm20_version_string])
 AC_CONFIG_MACRO_DIR([m4])
 AC_PROG_CC
-AC_PROG_CXX
 LT_INIT()
 AC_C_BIGENDIAN
 AX_PTHREAD([], [AC_MSG_ERROR([requires pthread])])