Merge bitcoin#20684: build: Define .INTERMEDIATE target once only

5e0dedb build: Define .INTERMEDIATE target once only (Hennadii Stepanov)

Pull request description:

  A new warning was introduced in bitcoin@22437fc (bitcoin#20470):
  ```
  $ ./autogen.sh
  ...
  Makefile.am:335: warning: .INTERMEDIATE was already defined in condition !BUILD_DARWIN, which is included in condition TRUE ...
  Makefile.am:139: ... '.INTERMEDIATE' previously defined here
  ...
  ```

  Fixed in this PR.

ACKs for top commit:
  jonatack:
    Tested and very light review ACK 5e0dedb

Tree-SHA512: ecf8de79ba394c36ee84e0b8d3ba78587e0f856259e9731e6bbb38d0baebfd083eb44d7ef6a386dd9e4508dd64fec1c2b9a007e175fbd4d986e845b1c300a649

Makefile.am

@@ -13,6 +13,7 @@ if ENABLE_MAN
 SUBDIRS += doc/man
 endif
 .PHONY: deploy FORCE
+.INTERMEDIATE: $(OSX_TEMP_ISO) $(COVERAGE_INFO)
 
 export PYTHONPATH
 
@@ -145,7 +146,6 @@ $(APP_DIST_DIR)/Applications:
 
 $(APP_DIST_EXTRAS): $(APP_DIST_DIR)/$(OSX_APP)/Contents/MacOS/Dash-Qt
 
-.INTERMEDIATE: $(OSX_TEMP_ISO)
 $(OSX_TEMP_ISO): $(APP_DIST_EXTRAS)
 	$(XORRISOFS) -D -l -V "$(OSX_VOLNAME)" -no-pad -r -dir-mode 0755 -o $@ dist
 
@@ -284,8 +284,6 @@ EXTRA_DIST += \
 
 CLEANFILES = $(OSX_DMG) $(BITCOIN_WIN_INSTALLER)
 
-.INTERMEDIATE: $(COVERAGE_INFO)
-
 DISTCHECK_CONFIGURE_FLAGS = --enable-man
 
 doc/doxygen/.stamp: doc/Doxyfile FORCE