build: use different progress flags based on the wget version

The Unikraft build system uses the `--show-progress` flag for
Wget1. This flag has been renamed to `--force-progress` in Wget2.
That's why we need to check the version of Wget before using either
one of the flags. There's a list of CLI changes from Wget1 to Wget2
here:

https://gitlab.com/gnuwget/wget2/-/wikis/Home

Signed-off-by: Thassilo Schulze <[email protected]>
Reviewed-by: Cezar Craciunoiu <[email protected]>
Reviewed-by: Stefan Jumarea <[email protected]>
Reviewed-by: Razvan Deaconescu <[email protected]>
Approved-by: Simon Kuenzer <[email protected]>
GitHub-Closes: unikraft#1442

Makefile

@@ -679,7 +679,11 @@ GZIP		:= gzip
 TAR		:= tar
 UNZIP		:= unzip -qq -u
 GIT		:= git
-WGET		:= wget
+ifneq (,$(findstring Wget2,$(shell wget --version)))
+WGET := wget -q --force-progress --progress=bar
+else
+WGET := wget -q --show-progress --progress=bar
+endif
 PYTHON          := python3
 SHA1SUM		:= sha1sum -b
 SHA256SUM	:= sha256sum -b

support/build/Makefile.rules

@@ -527,7 +527,7 @@ endef
 define fetchas =
 $(BUILD_DIR)/$(1)/$(3):
 	$(call verbose_cmd,WGET,$(1)':' $(2), \
-	 $(WGET) -q --show-progress --progress=bar -O $(BUILD_DIR)/$(1)/$(3) $(2) || \
+	 $(WGET) -O $(BUILD_DIR)/$(1)/$(3) $(2) || \
 	 $(RM) $(BUILD_DIR)/$(1)/$(3))
 
 $(call _chksum_origin,$(1),$(BUILD_DIR)/$(1)/$(3),$(BUILD_DIR)/$(1)/.chksum)
@@ -541,8 +541,8 @@ endef
 define fetchas2 =
 $(BUILD_DIR)/$(1)/$(4):
 	$(call verbose_cmd,WGET,$(1)':' $(2) [retry-with: $(3)], \
-	 $(WGET) -q --show-progress --progress=bar -O $(BUILD_DIR)/$(1)/$(4) $(2) || \
-	 $(WGET) -q --show-progress --progress=bar -O $(BUILD_DIR)/$(1)/$(4) $(3) || \
+	 $(WGET) -O $(BUILD_DIR)/$(1)/$(4) $(2) || \
+	 $(WGET) -O $(BUILD_DIR)/$(1)/$(4) $(3) || \
 	 $(RM) $(BUILD_DIR)/$(1)/$(4))
 
 $(call _chksum_origin,$(1),$(BUILD_DIR)/$(1)/$(4),$(BUILD_DIR)/$(1)/.chksum)