update build.sh help and change license to GPLv3

zcutil/build.sh

@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+# Copyright (c) 2019 The Hush developers
+# Released under the GPLv3
 
 set -eu -o pipefail
 
@@ -45,14 +47,14 @@ Usage:
 $0 --help
   Show this help message and exit.
 $0 [ --enable-lcov || --disable-tests ] [ --disable-mining ] [ --enable-proton ] [ --disable-libs ] [ MAKEARGS... ]
-  Build Zcash and most of its transitive dependencies from
-  source. MAKEARGS are applied to both dependencies and Zcash itself.
-  If --enable-lcov is passed, Zcash is configured to add coverage
+  Build Hush and most of its transitive dependencies from
+  source. MAKEARGS are applied to both dependencies and Hush itself.
+  If --enable-lcov is passed, Hush is configured to add coverage
   instrumentation, thus enabling "make cov" to work.
-  If --disable-tests is passed instead, the Zcash tests are not built.
-  If --disable-mining is passed, Zcash is configured to not build any mining
+  If --disable-tests is passed instead, the Hush tests are not built.
+  If --disable-mining is passed, Hush is configured to not build any mining
   code. It must be passed after the test arguments, if present.
-  If --enable-proton is passed, Zcash is configured to build the Apache Qpid Proton
+  If --enable-proton is passed, Hush is configured to build the Apache Qpid Proton
   library required for AMQP support. This library is not built by default.
   It must be passed after the test/mining arguments, if present.
 EOF
@@ -97,6 +99,7 @@ as --version
 ld -v
 
 HOST="$HOST" BUILD="$BUILD" NO_PROTON="$PROTON_ARG" "$MAKE" "$@" -C ./depends/ V=1
+
 ./autogen.sh
 
 CONFIG_SITE="$PWD/depends/$HOST/share/config.site" ./configure "$HARDENING_ARG" "$LCOV_ARG" "$TEST_ARG" "$MINING_ARG" "$PROTON_ARG" $CONFIGURE_FLAGS CXXFLAGS='-g'