unix: Convert to use FROZEN_MANIFEST to specify frozen code.

Removes symlinks in modules directory, all frozen code is now specified by
manifest.py.

ports/unix/Makefile

@@ -1,8 +1,10 @@
 -include mpconfigport.mk
 include ../../py/mkenv.mk
 
-FROZEN_DIR = scripts
-FROZEN_MPY_DIR = modules
+# use FROZEN_MANIFEST for new projects, others are legacy
+FROZEN_MANIFEST ?= manifest.py
+FROZEN_DIR =
+FROZEN_MPY_DIR =
 
 # define main target
 PROG = micropython
@@ -177,9 +179,9 @@ SRC_QSTR += $(SRC_C) $(LIB_SRC_C)
 # SRC_QSTR
 SRC_QSTR_AUTO_DEPS +=
 
-ifneq ($(FROZEN_MPY_DIR),)
-# To use frozen bytecode, put your .py files in a subdirectory (eg frozen/) and
-# then invoke make with FROZEN_MPY_DIR=frozen (be sure to build from scratch).
+ifneq ($(FROZEN_MANIFEST)$(FROZEN_MPY_DIR),)
+# To use frozen code create a manifest.py file with a description of files to
+# freeze, then invoke make with FROZEN_MANIFEST=manifest.py (be sure to build from scratch).
 CFLAGS += -DMICROPY_QSTR_EXTRA_POOL=mp_qstr_frozen_const_pool
 CFLAGS += -DMICROPY_MODULE_FROZEN_MPY
 CFLAGS += -DMPZ_DIG_SIZE=16 # force 16 bits to work on both 32 and 64 bit archs
@@ -215,7 +217,7 @@ fast:
 # build a minimal interpreter
 minimal:
 	$(MAKE) COPT="-Os -DNDEBUG" CFLAGS_EXTRA='-DMP_CONFIGFILE="<mpconfigport_minimal.h>"' \
-	    BUILD=build-minimal PROG=micropython_minimal FROZEN_DIR= FROZEN_MPY_DIR= \
+	    BUILD=build-minimal PROG=micropython_minimal FROZEN_MANIFEST= \
 	    MICROPY_PY_BTREE=0 MICROPY_PY_FFI=0 MICROPY_PY_SOCKET=0 MICROPY_PY_THREAD=0 \
 	    MICROPY_PY_TERMIOS=0 MICROPY_PY_USSL=0 \
 	    MICROPY_USE_READLINE=0
@@ -252,7 +254,7 @@ coverage:
 	    -Wold-style-definition -Wpointer-arith -Wshadow -Wuninitialized -Wunused-parameter \
 	    -DMICROPY_UNIX_COVERAGE' \
 	    LDFLAGS_EXTRA='-fprofile-arcs -ftest-coverage' \
-	    FROZEN_DIR=coverage-frzstr FROZEN_MPY_DIR=coverage-frzmpy \
+	    FROZEN_MANIFEST=manifest_coverage.py \
 	    BUILD=build-coverage PROG=micropython_coverage
 
 coverage_test: coverage

ports/unix/manifest.py

@@ -0,0 +1,2 @@
+freeze_as_mpy('$(MPY)/tools', 'upip.py')
+freeze_as_mpy('$(MPY)/tools', 'upip_utarfile.py', opt=3)

ports/unix/manifest_coverage.py

@@ -0,0 +1,2 @@
+freeze_as_str('coverage-frzstr')
+freeze_as_mpy('coverage-frzmpy')

ports/unix/modules/upip.py

@@ -1 +0,0 @@
-../../../tools/upip.py

ports/unix/modules/upip_utarfile.py

@@ -1 +0,0 @@
-../../../tools/upip_utarfile.py