envsetup.sh : Add more grep commands

- mm:      Builds all of the modules in the current directory.

- mmm:     Builds all of the modules in the supplied directories.

- cgrep:   Greps on all local C/C++ files.

- hgrep:   Greps on all local C/C++ header files.

- jgrep:   Greps on all local Java files.

- mkgrep:  Greps on all local make files.

- rcgrep:  Greps on all local .rc files.

- resgrep: Greps on all local res/*.xml files.

- shgrep:  Greps on all local .sh files.

- godir:   Go to the directory containing a file.

Look at the source to view more functions. The complete list is:

    find . -type f -name "*\.java" -print0 | xargs -0 grep --color -n "$@"

}

function mkgrep()

{

    find . -type f -name "*\.mk" -print0 | xargs -0 grep --color -n "$@"

}

function rcgrep()

{

    find . -type f -name "*\.rc" -print0 | xargs -0 grep --color -n "$@"

}

function shgrep()

{

    find . -type f -name "*\.sh" -print0 | xargs -0 grep --color -n "$@"

}

function cgrep()

{

    find . -type f \( -name '*.c' -o -name '*.cc' -o -name '*.cpp' -o -name '*.h' \) -print0 | xargs -0 grep --color -n "$@"

}

function hgrep()

{

    find . -type f -name "*\.h" -print0 | xargs -0 grep --color -n "$@"

}

function resgrep()

{

    for dir in `find . -name res -type d`; do find $dir -type f -name '*\.xml' -print0 | xargs -0 grep --color -n "$@"; done;