on-device build: Fix up ncurses and ninja, adjust some setup scripts,

and add dependency info to scripts/setup-termux.sh.

packages/ncurses/build.sh

@@ -61,6 +61,7 @@ termux_step_post_make_install() {
 		for file in lib${lib}w.so*; do
 			ln -s $file ${file/w./.}
 		done
+		rm -f lib${lib}.a
 		for file in lib${lib}w.a; do
 			ln -s $file ${file/w./.}
 		done

packages/ninja/build.sh

@@ -12,8 +12,12 @@ termux_step_configure() {
 }
 
 termux_step_make() {
-	termux_setup_ninja
-	ninja -j $TERMUX_MAKE_PROCESSES
+	if [ -n "$TERMUX_ON_DEVICE_BUILD" ]; then
+		$TERMUX_PKG_SRCDIR/configure.py --bootstrap
+	else
+		termux_setup_ninja
+		ninja -j $TERMUX_MAKE_PROCESSES
+	fi
 }
 
 termux_step_make_install() {

scripts/build/setup/termux_setup_cmake.sh

@@ -25,10 +25,6 @@ termux_setup_cmake() {
 			echo
 			echo "  pkg install cmake"
 			echo
-			echo "or build it from source with"
-			echo
-			echo "  ./build-package.sh cmake"
-			echo
 			exit 1
 		fi
 	fi

scripts/build/setup/termux_setup_ninja.sh

@@ -14,7 +14,10 @@ termux_setup_ninja() {
 		fi
 		export PATH=$NINJA_FOLDER:$PATH
 	else
-		if [ "$(dpkg-query -W -f '${db:Status-Status}\n' ninja 2>/dev/null)" != "installed" ]; then
+		local NINJA_PKG_VERSION=$(bash -c ". $TERMUX_SCRIPTDIR/packages/ninja/build.sh; echo \$TERMUX_PKG_VERSION")
+		if ([ ! -e "$TERMUX_BUILT_PACKAGES_DIRECTORY/ninja" ] ||
+		    [ "$(cat "$TERMUX_BUILT_PACKAGES_DIRECTORY/ninja")" != "$NINJA_PKG_VERSION" ]) &&
+		   [ "$(dpkg-query -W -f '${db:Status-Status}\n' ninja 2>/dev/null)" != "installed" ]; then
 			echo "Package 'ninja' is not installed."
 			echo "You can install it with"
 			echo

scripts/build/setup/termux_setup_protobuf.sh

@@ -17,18 +17,5 @@ termux_setup_protobuf() {
 		fi
 
 		export PATH=$_PROTOBUF_FOLDER/bin/:$PATH
-	else
-		if [ "$(dpkg-query -W -f '${db:Status-Status}\n' protobuf 2>/dev/null)" != "installed" ]; then
-			echo "Package 'protobuf' is not installed."
-			echo "You can install it with"
-			echo
-			echo "  pkg install protobuf"
-			echo
-			echo "or build it from source with"
-			echo
-			echo "  ./build-package.sh libprotobuf"
-			echo
-			exit 1
-		fi
 	fi
 }

scripts/setup-termux.sh

@@ -1,18 +1,22 @@
 #!/data/data/com.termux/files/usr/bin/bash
 
+# Tier 1 packages are required by the core build scripts in scripts/build/.
+# Tier 2 packages are required to build many packages.
+# Some packages are installed by default and aren't labeled here.
 PACKAGES="autoconf"
 PACKAGES+=" automake"
 PACKAGES+=" bc"
 PACKAGES+=" binutils-gold"
 PACKAGES+=" bison"
 PACKAGES+=" bzip2"
-PACKAGES+=" clang"
+PACKAGES+=" clang"         # Tier 1: required to build termux-elf-cleaner, which
+                           # is built first by the core scripts.
 PACKAGES+=" cmake"
 PACKAGES+=" coreutils"
 PACKAGES+=" curl"
 PACKAGES+=" diffutils"
 PACKAGES+=" ed"
-PACKAGES+=" file"
+PACKAGES+=" file"          # Tier 1: required by a core script
 PACKAGES+=" findutils"
 PACKAGES+=" flex"
 PACKAGES+=" gawk"
@@ -26,13 +30,13 @@ PACKAGES+=" libtool"
 PACKAGES+=" lzip"
 PACKAGES+=" lzop"
 PACKAGES+=" m4"
-PACKAGES+=" make"
-PACKAGES+=" ninja"
+PACKAGES+=" make"          # Tier 2: used for all Makefile projects and to build itself
+PACKAGES+=" ninja"         # Tier 2: used by default to build all CMake projects
 PACKAGES+=" patch"
 PACKAGES+=" perl"
-PACKAGES+=" pkg-config"
+PACKAGES+=" pkg-config"    # Tier 2: used to build many packages
 PACKAGES+=" protobuf"
-PACKAGES+=" python"
+PACKAGES+=" python"        # Tier 1: required for buildorder.py core script
 PACKAGES+=" python2"
 PACKAGES+=" rust"
 PACKAGES+=" sed"