math/elpa: Unbreak build with GCC 10

src/elpa2/kernels/real_template.F90:117:37:

117 |        & (q(i,1),hh, nb, ldq, ldh, s)
    |                                     1

Error: Type mismatch in argument 'q' at (1); passed REAL(8) to COMPLEX(8)
src/elpa2/kernels/real_template.F90:133:37:

133 |        & (q(i,1),hh, nb, ldq, ldh, s)
    |                                     1

Error: Type mismatch in argument 'q' at (1); passed REAL(8) to COMPLEX(8)
src/elpa2/kernels/real_template.F90:145:37:

145 |        & (q(i,1),hh, nb, ldq, ldh, s)
    |                                     1

Error: Type mismatch in argument 'q' at (1); passed REAL(8) to COMPLEX(8)

http://package18.nyi.freebsd.org/data/121amd64-default-PR244494/2020-06-10_18h04m44s/logs/errors/elpa-2019.05.002_2.log

PR: 246700