android: aco: add aco_form_hard_clauses.cpp to Makefile.sources

Fixes the following building error:

external/mesa/src/amd/compiler/aco_interface.cpp:160:
error: undefined reference to 'aco::form_hard_clauses(aco::Program*)'

Fixes: 3dfbed2a8 ("aco: create s_clause on GFX10+")
Signed-off-by: Mauro Rossi <issor.oruam@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7380>

src/amd/Makefile.sources

@@ -85,6 +85,7 @@ ACO_FILES = \
 	compiler/aco_ir.cpp \
 	compiler/aco_ir.h \
 	compiler/aco_assembler.cpp \
+	compiler/aco_form_hard_clauses.cpp \
 	compiler/aco_insert_exec_mask.cpp \
 	compiler/aco_insert_NOPs.cpp \
 	compiler/aco_insert_waitcnt.cpp \