perf: disable slang support

libs/slang2 is getting picked up from the packages feed, if the slang2
is compiled first and then if you try to compile perf, it fails
due to unmet dependency.

Fixes:
Package perf is missing dependencies for the following libraries:
libslang.so.2

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/19123
(cherry picked from commit 764576eb5b)
Link: https://github.com/openwrt/openwrt/pull/19166
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/devel/perf/Makefile

@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=perf
 PKG_VERSION:=$(LINUX_VERSION)
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_BUILD_FLAGS:=no-mips16 no-lto
 PKG_BUILD_PARALLEL:=1
@@ -50,6 +50,7 @@ MAKE_FLAGS = \
 	NO_LZMA=1 \
 	NO_BACKTRACE=1 \
 	NO_LIBNUMA=1 \
+	NO_SLANG=1 \
 	NO_GTK2=1 \
 	NO_LIBAUDIT=1 \
 	NO_LIBCRYPTO=1 \