Fixup usage of lex/yacc in src/freedreno/Android.ir3.mk

Add M4 environment variable for flex so it uses our prebuilt instead
of the one in $PATH and add dependencies on the prebuilt executables
and data files for flex and bison.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Change-Id: I83d56e76871f2552e88738176e2e0e6103d66a2a
1 file changed