Include: added symbol table to the binary for global variables.

src/lib-sieve/plugins/include/cmd-import.c

src/lib-sieve/plugins/include/ext-include-binary.c

src/lib-sieve/plugins/include/ext-include-binary.h

src/lib-sieve/plugins/include/ext-include-common.c

src/lib-sieve/plugins/include/ext-include-common.h

src/lib-sieve/plugins/include/ext-include-variables.c

src/lib-sieve/plugins/include/ext-include-variables.h

src/lib-sieve/plugins/include/ext-include.c

src/lib-sieve/plugins/variables/ext-variables-common.c

src/lib-sieve/plugins/variables/sieve-ext-variables.h

src/lib-sieve/sieve-binary-dumper.c

src/lib-sieve/sieve-binary-dumper.h

src/lib-sieve/sieve-extensions.h

src/lib-sieve/sieve-generator.c

src/testsuite/ext-testsuite.c

tests/extensions/include/errors.svtest

tests/extensions/include/errors/import-runtime.sieve

tests/extensions/include/errors/variables.sieve