Makefile: explicitly list which example capture subdirs to install

Commit 4fafe81 as of 2012-05-14 introduced a simple "make install"
target. The asterisk wildcard and the additional Makefile "negation" use
to work for clean checkouts, but are considered too greedy a pattern for
locally modified work areas during development.

Explicitly list which subdirs to install to the filesystem. Which
improves robustness, avoids clutter, and is considered acceptable
maintenance overhead since adding more top level directories should
be rare an event. The explicit list is also easy to trim down should
developers want that during local work.

Phrase the subdirectories list such that users can specify additional
items in the "make install" invocation.

Makefile

@@ -21,6 +21,34 @@ VERSION = "0.1.0"
 
 DESTDIR ?= /usr/local/share/sigrok-dumps
 
+# Be explicit about which files or subdirectories to install.
+# Update this list when adding a new top level subdirectory to the
+# set of example captures. It's assumed that this event is rare.
+# The list is phrased such that users can specify additional items
+# when they invoke the 'make install' command.
+FILES_DIRS += ac97 am230x arm_trace aud avr_isp avr_pdi
+FILES_DIRS += caliper can cec
+FILES_DIRS += dac dali dcc dcf77 display dmx512 dsi
+FILES_DIRS += flexray fsk
+FILES_DIRS += gpib graycode
+FILES_DIRS += i2c i2s ir
+FILES_DIRS += jtag
+FILES_DIRS += led lens_mounts lpc
+FILES_DIRS += maple_bus mcs48 mdio microwire miller misc morse mouse_sensors
+FILES_DIRS += nfc nonstandard_eeproms
+FILES_DIRS += onewire ook
+FILES_DIRS += pjon ps2 pwm
+FILES_DIRS += qi
+FILES_DIRS += rc rfid
+FILES_DIRS += sae-j1850 sdcard sdq sht7x signature sle44xx spdif spi
+FILES_DIRS += stepper_motor swd swim
+FILES_DIRS += tdm_audio
+FILES_DIRS += uart usb usb_power_delivery
+FILES_DIRS += vfd
+FILES_DIRS += wiegand
+FILES_DIRS += xy2-100
+FILES_DIRS += z80
+
 all:
 	@echo "Run 'make dist' to create a tarball."
 
@@ -35,6 +63,4 @@ dist: ChangeLog
 
 install:
 	@mkdir -p $(DESTDIR)
-	@cp -r * $(DESTDIR)
-	@rm -f $(DESTDIR)/Makefile
-
+	@cp -r $(FILES_DIRS) $(DESTDIR)