Revert "ngtcp2: build with 0.17.0 and nghttp3 0.13.0"
https://github.com/curl/curl/commit/e0093b4b732f6495b0fb1cd6747cbfedcdcf63ed

Index: configure.ac
--- configure.ac.orig
+++ configure.ac
@@ -2926,42 +2926,42 @@ if test X"$want_tcp2" != Xno; then
 fi
 
 if test "x$NGTCP2_ENABLED" = "x1" -a "x$OPENSSL_ENABLED" = "x1"; then
-  dnl backup the pre-ngtcp2_crypto_quictls variables
+  dnl backup the pre-ngtcp2_crypto_openssl variables
   CLEANLDFLAGS="$LDFLAGS"
   CLEANCPPFLAGS="$CPPFLAGS"
   CLEANLIBS="$LIBS"
 
-  CURL_CHECK_PKGCONFIG(libngtcp2_crypto_quictls, $want_tcp2_path)
+  CURL_CHECK_PKGCONFIG(libngtcp2_crypto_openssl, $want_tcp2_path)
 
   if test "$PKGCONFIG" != "no" ; then
-    LIB_NGTCP2_CRYPTO_QUICTLS=`CURL_EXPORT_PCDIR([$want_tcp2_path])
-      $PKGCONFIG --libs-only-l libngtcp2_crypto_quictls`
-    AC_MSG_NOTICE([-l is $LIB_NGTCP2_CRYPTO_QUICTLS])
+    LIB_NGTCP2_CRYPTO_OPENSSL=`CURL_EXPORT_PCDIR([$want_tcp2_path])
+      $PKGCONFIG --libs-only-l libngtcp2_crypto_openssl`
+    AC_MSG_NOTICE([-l is $LIB_NGTCP2_CRYPTO_OPENSSL])
 
-    CPP_NGTCP2_CRYPTO_QUICTLS=`CURL_EXPORT_PCDIR([$want_tcp2_path]) dnl
-      $PKGCONFIG --cflags-only-I libngtcp2_crypto_quictls`
-    AC_MSG_NOTICE([-I is $CPP_NGTCP2_CRYPTO_QUICTLS])
+    CPP_NGTCP2_CRYPTO_OPENSSL=`CURL_EXPORT_PCDIR([$want_tcp2_path]) dnl
+      $PKGCONFIG --cflags-only-I libngtcp2_crypto_openssl`
+    AC_MSG_NOTICE([-I is $CPP_NGTCP2_CRYPTO_OPENSSL])
 
-    LD_NGTCP2_CRYPTO_QUICTLS=`CURL_EXPORT_PCDIR([$want_tcp2_path])
-      $PKGCONFIG --libs-only-L libngtcp2_crypto_quictls`
-    AC_MSG_NOTICE([-L is $LD_NGTCP2_CRYPTO_QUICTLS])
+    LD_NGTCP2_CRYPTO_OPENSSL=`CURL_EXPORT_PCDIR([$want_tcp2_path])
+      $PKGCONFIG --libs-only-L libngtcp2_crypto_openssl`
+    AC_MSG_NOTICE([-L is $LD_NGTCP2_CRYPTO_OPENSSL])
 
-    LDFLAGS="$LDFLAGS $LD_NGTCP2_CRYPTO_QUICTLS"
-    CPPFLAGS="$CPPFLAGS $CPP_NGTCP2_CRYPTO_QUICTLS"
-    LIBS="$LIB_NGTCP2_CRYPTO_QUICTLS $LIBS"
+    LDFLAGS="$LDFLAGS $LD_NGTCP2_CRYPTO_OPENSSL"
+    CPPFLAGS="$CPPFLAGS $CPP_NGTCP2_CRYPTO_OPENSSL"
+    LIBS="$LIB_NGTCP2_CRYPTO_OPENSSL $LIBS"
 
     if test "x$cross_compiling" != "xyes"; then
-      DIR_NGTCP2_CRYPTO_QUICTLS=`echo $LD_NGTCP2_CRYPTO_QUICTLS | $SED -e 's/^-L//'`
+      DIR_NGTCP2_CRYPTO_OPENSSL=`echo $LD_NGTCP2_CRYPTO_OPENSSL | $SED -e 's/^-L//'`
     fi
-    AC_CHECK_LIB(ngtcp2_crypto_quictls, ngtcp2_crypto_recv_client_initial_cb,
+    AC_CHECK_LIB(ngtcp2_crypto_openssl, ngtcp2_crypto_recv_client_initial_cb,
       [
        AC_CHECK_HEADERS(ngtcp2/ngtcp2_crypto.h,
           NGTCP2_ENABLED=1
-          AC_DEFINE(USE_NGTCP2_CRYPTO_QUICTLS, 1, [if ngtcp2_crypto_quictls is in use])
-          AC_SUBST(USE_NGTCP2_CRYPTO_QUICTLS, [1])
-          CURL_LIBRARY_PATH="$CURL_LIBRARY_PATH:$DIR_NGTCP2_CRYPTO_QUICTLS"
+          AC_DEFINE(USE_NGTCP2_CRYPTO_OPENSSL, 1, [if ngtcp2_crypto_openssl is in use])
+          AC_SUBST(USE_NGTCP2_CRYPTO_OPENSSL, [1])
+          CURL_LIBRARY_PATH="$CURL_LIBRARY_PATH:$DIR_NGTCP2_CRYPTO_OPENSSL"
           export CURL_LIBRARY_PATH
-          AC_MSG_NOTICE([Added $DIR_NGTCP2_CRYPTO_QUICTLS to CURL_LIBRARY_PATH])
+          AC_MSG_NOTICE([Added $DIR_NGTCP2_CRYPTO_OPENSSL to CURL_LIBRARY_PATH])
        )
       ],
         dnl not found, revert back to clean variables
@@ -2971,11 +2971,11 @@ if test "x$NGTCP2_ENABLED" = "x1" -a "x$OPENSSL_ENABLE
     )
 
   else
-    dnl no ngtcp2_crypto_quictls pkg-config found, deal with it
+    dnl no ngtcp2_crypto_openssl pkg-config found, deal with it
     if test X"$want_tcp2" != Xdefault; then
       dnl To avoid link errors, we do not allow --with-ngtcp2 without
       dnl a pkgconfig file
-      AC_MSG_ERROR([--with-ngtcp2 was specified but could not find ngtcp2_crypto_quictls pkg-config file.])
+      AC_MSG_ERROR([--with-ngtcp2 was specified but could not find ngtcp2_crypto_openssl pkg-config file.])
     fi
   fi
 fi