build: remove protobuf requirement

Protobuf was only needed for BIP70 payment requests

Author: patricklodder

Diff for: configure.ac

@@ -231,8 +231,6 @@ AC_ARG_WITH([armv82-crypto],
   [armv82_crypto=$withval],
   [armv82_crypto=no])
 
-AC_ARG_WITH([protoc-bindir],[AS_HELP_STRING([--with-protoc-bindir=BIN_DIR],[specify protoc bin path])], [protoc_bin_path=$withval], [])
-
 AC_ARG_ENABLE(man,
     [AS_HELP_STRING([--disable-man],
                     [do not install man pages (default is to install)])],,
@@ -854,7 +852,6 @@ if test x$use_pkgconfig = xyes; then
     [
       PKG_CHECK_MODULES([SSL], [libssl],, [AC_MSG_ERROR(openssl  not found.)])
       PKG_CHECK_MODULES([CRYPTO], [libcrypto],,[AC_MSG_ERROR(libcrypto  not found.)])
-      BITCOIN_QT_CHECK([PKG_CHECK_MODULES([PROTOBUF], [protobuf], [have_protobuf=yes], [BITCOIN_QT_FAIL(libprotobuf not found)])])
       if test x$use_qr != xno; then
         BITCOIN_QT_CHECK([PKG_CHECK_MODULES([QR], [libqrencode], [have_qrencode=yes], [have_qrencode=no])])
       fi
@@ -914,7 +911,6 @@ else
     esac
   fi
 
-  BITCOIN_QT_CHECK(AC_CHECK_LIB([protobuf] ,[main],[PROTOBUF_LIBS=-lprotobuf], BITCOIN_QT_FAIL(libprotobuf not found)))
   if test x$use_qr != xno; then
     BITCOIN_QT_CHECK([AC_CHECK_LIB([qrencode], [main],[QR_LIBS=-lqrencode], [have_qrencode=no])])
     BITCOIN_QT_CHECK([AC_CHECK_HEADER([qrencode.h],, have_qrencode=no)])
@@ -1019,8 +1015,6 @@ AM_CONDITIONAL([EMBEDDED_UNIVALUE],[test x$need_bundled_univalue = xyes])
 AC_SUBST(UNIVALUE_CFLAGS)
 AC_SUBST(UNIVALUE_LIBS)
 
-BITCOIN_QT_PATH_PROGS([PROTOC], [protoc],$protoc_bin_path)
-
 AC_MSG_CHECKING([whether to build dogecoind])
 AM_CONDITIONAL([BUILD_BITCOIND], [test x$build_bitcoind = xyes])
 AC_MSG_RESULT($build_bitcoind)
@@ -1220,7 +1214,6 @@ AC_SUBST(SSL_LIBS)
 AC_SUBST(EVENT_LIBS)
 AC_SUBST(EVENT_PTHREADS_LIBS)
 AC_SUBST(ZMQ_LIBS)
-AC_SUBST(PROTOBUF_LIBS)
 AC_SUBST(QR_LIBS)
 AC_SUBST(HAVE_FDATASYNC)
 AC_SUBST(HAVE_FULLFSYNC)