feat(st): support gcc as linker

One of the internal make rules for ST platforms uses the linker, but
with dedicated options for ld. Adapt the rule to check if the linker
is gcc and use updated options.

Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
Change-Id: If566dccfa329f9d34a80673a60c6fadd642a0231
1 file changed