Get rid of the old PB TC (#5860)

Makefile

@@ -20,8 +20,6 @@ ANDROID_NAME?=$(VERSION)
 # set PATH to find CC in managed toolchains
 ifeq ($(TARGET), android)
 	PATH:=$(ANDROID_TOOLCHAIN)/bin:$(PATH)
-else ifeq ($(TARGET), pocketbook)
-	PATH:=$(POCKETBOOK_TOOLCHAIN)/bin:$(PATH)
 endif
 
 MACHINE=$(shell PATH=$(PATH) $(CC) -dumpmachine 2>/dev/null)
@@ -513,9 +511,6 @@ androiddev: androidupdate
 android-toolchain:
 	$(MAKE) -C $(KOR_BASE) android-toolchain
 
-pocketbook-toolchain:
-	$(MAKE) -C $(KOR_BASE) pocketbook-toolchain
-
 
 # for gettext
 DOMAIN=koreader

kodev

@@ -220,10 +220,6 @@ ${SUPPORTED_TARGETS}"
             assert_ret_zero $?
             ;;
         pocketbook)
-            if ! command -v arm-obreey-linux-gnueabi-gcc >/dev/null && [ ! -d "${CURDIR}/base/toolchain/pocketbook-toolchain" ]; then
-                make pocketbook-toolchain
-                assert_ret_zero $?
-            fi
             make TARGET=pocketbook
             assert_ret_zero $?
             ;;