package/icu: adjust version information

The icu upstream developers have a strange way of labelling their versions:

 - The Github tags are named release-XX-Y, and therefore the versions
   referenced by by Release Monitoring look like 60-2 or 64-1.

 - The tarballs contain the version with an underscore separator, i.e
   60_2 or 64_1.

 - The directories on http://download.icu-project.org/files/icu4c/
   contain the version with a dot separator, i.e 60.2 or 64.1.

In order to have our <pkg>_VERSION match the one on Release
Monitoring, we adjust it to use the underscore separator, and then
further tweak the ICU_SOURCE and ICU_SITE definitions to keep
everything working.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/icu/icu.mk

@@ -4,9 +4,12 @@
 #
 ################################################################################
 
-ICU_VERSION = 60.2
-ICU_SOURCE = icu4c-$(subst .,_,$(ICU_VERSION))-src.tgz
-ICU_SITE = http://download.icu-project.org/files/icu4c/$(ICU_VERSION)
+# Git tags (and therefore versions on release-monitoring.org) use the
+# XX-Y format, but the tarballs are named XX_Y and the containing
+# directories XX.Y.
+ICU_VERSION = 60-2
+ICU_SOURCE = icu4c-$(subst -,_,$(ICU_VERSION))-src.tgz
+ICU_SITE = http://download.icu-project.org/files/icu4c/$(subst -,.,$(ICU_VERSION))
 ICU_LICENSE = ICU License
 ICU_LICENSE_FILES = LICENSE