Modify meson.build to run on Ubuntu 22.04

When compiling hammer have thrown error like in this issue:
riscv-software-src/riscv-isa-sim#1618.
Fixed via removing fesvr directory from includes in meson.build.
Related PR in Spike repo:
riscv-software-src/riscv-isa-sim#1619.

Author: serge0699

meson.build

@@ -48,7 +48,6 @@ riscv_libdep = cpp.find_library('riscv', dirs: spike_lib_directory, required: tr
 
 spike_incdirs = include_directories([
                                       spike_include_directory + 'softfloat',
-                                      spike_include_directory + 'fesvr',
                                       spike_include_directory,
                                       '.'
                                     ])