Can't pass flags containing an equals sign(=) with multiple executables

[LKedward]

I was trying to pass the -fsanitize=address flag to gfortran, but fpm/M_CLI2 is treating address as an unnamed parameter.

To reproduce:

$ fpm new test && cd test
$ cp app/main.f90 app/main2.f90
$ fpm run --flag "-fsanitize=address"

Output:

 + mkdir -p build/dependencies
fpm::run<ERROR> specified names "address" not found.

 Available names:
main2  test
STOP 1

[urbanjost]

Doing some further testing but will put in a pull request to use a more recent version of M_CLI2. Trying to decide what all needs added to test suite too.

[dependencies.M_CLI2]
git = "https://github.com/urbanjost/M_CLI2.git"
rev = "143ab3a4b4f82810f2dda2333cb5a0f116b955e5"