freeradius3: move "release_" from PKG_VERSION

The substring "release_" does not reflect the version number.
In addition, package names will be shorter.

Signed-off-by: Alexey Dobrovolsky <dobrovolskiy.alexey@gmail.com>

net/freeradius3/Makefile

@@ -8,10 +8,10 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=freeradius3
-PKG_VERSION:=release_3_0_21
-PKG_RELEASE:=7
+PKG_VERSION:=3_0_21
+PKG_RELEASE:=1
 
-PKG_SOURCE:=$(PKG_VERSION).tar.gz
+PKG_SOURCE:=release_$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://github.com/FreeRADIUS/freeradius-server/archive
 PKG_HASH:=b2014372948a92f86cfe2cf43c58ef47921c03af05666eb9d6416bdc6eeaedc2
 
@@ -20,7 +20,7 @@ PKG_LICENSE:=GPL-2.0
 PKG_LICENSE_FILES:=COPYRIGHT LICENSE
 PKG_CPE_ID:=cpe:/a:freeradius:freeradius
 
-PKG_BUILD_DIR:=$(BUILD_DIR)/freeradius-server-$(PKG_VERSION)
+PKG_BUILD_DIR:=$(BUILD_DIR)/freeradius-server-release_$(PKG_VERSION)
 PKG_FIXUP:=autoreconf
 PYTHON3_PKG_BUILD:=0