scripts: add cmake to install-prereq scripts

Tools/scripts/install-prereqs-arch.sh

@@ -8,7 +8,7 @@ OPT="/opt"
 
 BASE_PKGS="base-devel ccache git-core gsfonts tk wget"
 SITL_PKGS="python2-pip python-pip wxpython2.8 opencv python2-numpy python2-scipy"
-PX4_PKGS="lib32-glibc zip zlib ncurses"
+PX4_PKGS="lib32-glibc zip zlib ncurses cmake"
 
 PYTHON2_PKGS="future lxml pymavlink MAVProxy argparse matplotlib pyparsing"
 PYTHON3_PKGS="pyserial empy"

Tools/scripts/install-prereqs-ubuntu.sh

@@ -6,7 +6,7 @@ BASE_PKGS="build-essential ccache g++ gawk git make wget"
 PYTHON_PKGS="future lxml pymavlink MAVProxy"
 PX4_PKGS="python-argparse openocd flex bison libncurses5-dev \
           autoconf texinfo libftdi-dev zlib1g-dev \
-          zip genromfs python-empy libc6-i386"
+          zip genromfs python-empy libc6-i386 cmake cmake-data"
 BEBOP_PKGS="g++-arm-linux-gnueabihf"
 SITL_PKGS="libtool libxml2-dev libxslt1-dev python-dev python-pip python-setuptools python-matplotlib python-serial python-scipy python-opencv python-numpy python-pyparsing realpath"
 ASSUME_YES=false