ntru: Remove legacy NTRU key exchange method

configure.ac

@@ -153,7 +153,6 @@ ARG_ENABL_SET([md4],            [enable MD4 software implementation plugin.])
 ARG_DISBL_SET([md5],            [disable MD5 software implementation plugin.])
 ARG_ENABL_SET([mgf1],           [enable the MGF1 software implementation plugin.])
 ARG_DISBL_SET([nonce],          [disable nonce generation plugin.])
-ARG_ENABL_SET([ntru],           [enables the NTRU crypto plugin.])
 ARG_ENABL_SET([openssl],        [enables the OpenSSL crypto plugin.])
 ARG_ENABL_SET([wolfssl],        [enables the wolfSSL crypto plugin.])
 ARG_ENABL_SET([padlock],        [enables VIA Padlock crypto plugin.])
@@ -509,7 +508,7 @@ if test x$tpm = xtrue; then
 	tss_tss2=true
 fi
 
-if test x$gmp = xtrue -o x$ntru = xtrue; then
+if test x$gmp = xtrue; then
 	mgf1=true
 fi
 
@@ -1588,7 +1587,6 @@ ADD_PLUGIN([kdf],                  [s charon pki scripts nm cmd])
 ADD_PLUGIN([ctr],                  [s charon scripts nm cmd])
 ADD_PLUGIN([ccm],                  [s charon scripts nm cmd])
 ADD_PLUGIN([gcm],                  [s charon scripts nm cmd])
-ADD_PLUGIN([ntru],                 [s charon scripts nm cmd])
 ADD_PLUGIN([drbg],                 [s charon pki scripts nm cmd])
 ADD_PLUGIN([curl],                 [s charon pki scripts nm cmd])
 ADD_PLUGIN([files],                [s charon pki scripts nm cmd])
@@ -1756,7 +1754,6 @@ AM_CONDITIONAL(USE_CTR, test x$ctr = xtrue)
 AM_CONDITIONAL(USE_CCM, test x$ccm = xtrue)
 AM_CONDITIONAL(USE_GCM, test x$gcm = xtrue)
 AM_CONDITIONAL(USE_AF_ALG, test x$af_alg = xtrue)
-AM_CONDITIONAL(USE_NTRU, test x$ntru = xtrue)
 AM_CONDITIONAL(USE_DRBG, test x$drbg = xtrue)
 
 #  charon plugins
@@ -2037,7 +2034,6 @@ AC_CONFIG_FILES([
 	src/libstrongswan/plugins/gcm/Makefile
 	src/libstrongswan/plugins/af_alg/Makefile
 	src/libstrongswan/plugins/drbg/Makefile
-	src/libstrongswan/plugins/ntru/Makefile
 	src/libstrongswan/plugins/test_vectors/Makefile
 	src/libstrongswan/tests/Makefile
 	src/libipsec/Makefile