Revert "config: Enable RUST"

There's some issues with mitigation that's not supported by Rust yet
causing objtool to spew warnings. Disable RUST again as (currently) it
adds little value to a generic distribution kernel.

This reverts commit 14fad3df44. Also keep
GCC_PLUGINS disabled as we don't make use of them.

Fixes: https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/82

config

@@ -11,7 +11,6 @@ CONFIG_AS_VERSION=24300
 CONFIG_LD_IS_BFD=y
 CONFIG_LD_VERSION=24300
 CONFIG_LLD_VERSION=0
-CONFIG_RUST_IS_AVAILABLE=y
 CONFIG_CC_CAN_LINK=y
 CONFIG_CC_CAN_LINK_STATIC=y
 CONFIG_CC_HAS_ASM_GOTO_OUTPUT=y
@@ -316,9 +315,6 @@ CONFIG_PERF_EVENTS=y
 
 CONFIG_SYSTEM_DATA_VERIFICATION=y
 CONFIG_PROFILING=y
-CONFIG_RUST=y
-CONFIG_RUSTC_VERSION_TEXT="rustc 1.81.0 (eeb90cda1 2024-09-04)"
-CONFIG_BINDGEN_VERSION_TEXT="bindgen 0.70.1"
 CONFIG_TRACEPOINTS=y
 
 #
@@ -2349,7 +2345,6 @@ CONFIG_PREVENT_FIRMWARE_BUILD=y
 #
 CONFIG_FW_LOADER=y
 CONFIG_FW_LOADER_DEBUG=y
-# CONFIG_RUST_FW_LOADER_ABSTRACTIONS is not set
 CONFIG_FW_LOADER_PAGED_BUF=y
 CONFIG_FW_LOADER_SYSFS=y
 CONFIG_EXTRA_FIRMWARE=""
@@ -2664,7 +2659,6 @@ CONFIG_ATA_OVER_ETH=m
 CONFIG_XEN_BLKDEV_FRONTEND=m
 CONFIG_XEN_BLKDEV_BACKEND=m
 CONFIG_VIRTIO_BLK=m
-# CONFIG_BLK_DEV_RUST_NULL is not set
 CONFIG_BLK_DEV_RBD=m
 CONFIG_BLK_DEV_UBLK=m
 CONFIG_BLKDEV_UBLK_LEGACY_OPCODES=y
@@ -11946,8 +11940,5 @@ CONFIG_MEMTEST=y
 #
 # Rust hacking
 #
-# CONFIG_RUST_DEBUG_ASSERTIONS is not set
-CONFIG_RUST_OVERFLOW_CHECKS=y
-# CONFIG_RUST_BUILD_ASSERT_ALLOW is not set
 # end of Rust hacking
 # end of Kernel hacking