kernel: Remove darwin support

Darwin kernel build is not supported for >=5.10
and non-standard clang versions.
Another side effect is that it causes LD_LIBRARY_PATH
to get overwritten, which breaks certain configurations.
Let's just get rid of it since AOSP darwin build is no longer supported.

Change-Id: I9ac642996b90937bd9c52138fb06bf1eff901c8b
diff --git a/config/BoardConfigKernel.mk b/config/BoardConfigKernel.mk
index 77dfa9a..d60297e 100644
--- a/config/BoardConfigKernel.mk
+++ b/config/BoardConfigKernel.mk
@@ -93,7 +93,6 @@
 KERNEL_MAKE_FLAGS += -j$(shell getconf _NPROCESSORS_ONLN)
 
 TOOLS_PATH_OVERRIDE := \
-    LD_LIBRARY_PATH=$(BUILD_TOP)/prebuilts/tools-lineage/$(HOST_PREBUILT_TAG)/lib:$$LD_LIBRARY_PATH \
     PERL5LIB=$(BUILD_TOP)/prebuilts/tools-lineage/common/perl-base
 
 # 5.10+ can fully compile without gcc
@@ -151,11 +150,7 @@
         endif
     endif
 
-    ifeq ($(HOST_OS),darwin)
-        KERNEL_MAKE_FLAGS += HOSTCFLAGS="-I$(BUILD_TOP)/external/elfutils/libelf -I/usr/local/opt/openssl/include" HOSTLDFLAGS="-L/usr/local/opt/openssl/lib -fuse-ld=lld"
-    else
-        KERNEL_MAKE_FLAGS += CPATH="/usr/include:/usr/include/x86_64-linux-gnu" HOSTLDFLAGS="-L/usr/lib/x86_64-linux-gnu -L/usr/lib64 -fuse-ld=lld"
-    endif
+    KERNEL_MAKE_FLAGS += CPATH="/usr/include:/usr/include/x86_64-linux-gnu" HOSTLDFLAGS="-L/usr/lib/x86_64-linux-gnu -L/usr/lib64 -fuse-ld=lld"
 
     ifeq ($(KERNEL_ARCH),arm64)
         # Add 32-bit GCC to PATH so that arm-linux-androidkernel-as is available for CONFIG_COMPAT_VDSO