Deal with read errors in switch_xml.c

Unlike fread(3), read(3) will return -1 on error.  We were assigning
the result of read to a potentially unsigned variable, and passing the
result down to switch_xml_parse_str() where it would end up
determining how many bytes to malloc(3).
Remove binary executables in libs/srtp

These files were introduced in commit 72e2d183c1d63a224742e243e4b1fd412f876758.
Prevent sha1_init et al from being undefined

sha1_init, sha1_update, and sha1_final were ending up as undefined
symbols in libfreeswitch.so because of the inline declaration, which
caused us to blow up while linking the freeswitch executable.  Declare
these as static inline instead.