build: stop including libboost_program_options

libboost_program_options caused us a various problems such as
differences in visibility between versions (issue #1040),
significant code size (issue #980) and others, so in the
previous patches we removed all its uses in OSv and its
small utility applications (like cpiod and httpserver).
Now that it's no longer used, we can stop compiling it into
the kernel, or pretending (in elf.cc) that it is included
in the kernel.

Signed-off-by: Nadav Har'El <[email protected]>
Message-Id: <[email protected]>

Makefile

@@ -1862,8 +1862,7 @@ else
     boost-includes = -isystem $(miscbase)/usr/include
 endif
 
-boost-libs := $(boost-lib-dir)/libboost_program_options$(boost-mt).a \
-              $(boost-lib-dir)/libboost_system$(boost-mt).a
+boost-libs := $(boost-lib-dir)/libboost_system$(boost-mt).a
 
 ifeq ($(nfs), true)
 	nfs-lib = $(out)/libnfs.a

core/elf.cc

@@ -1154,12 +1154,10 @@ program::program(void* addr)
 #ifdef __x86_64__
           "ld-linux-x86-64.so.2",
           "libboost_system.so.1.55.0",
-          "libboost_program_options.so.1.55.0",
 #endif /* __x86_64__ */
 #ifdef __aarch64__
           "ld-linux-aarch64.so.1",
           "libboost_system-mt.so.1.55.0",
-          "libboost_program_options-mt.so.1.55.0",
 #endif /* __aarch64__ */
           "libpthread.so.0",
           "libdl.so.2",