gnome-shell segfault in g_strsplit() on RISC-V

gnome-shell 44.rc segfault in g_strsplit() on RISC-V:

Program terminated with signal SIGSEGV, Segmentation fault.
#0 __GI_strchr (s=s@entry=0x13ea <error: Cannot access memory at address 0x13ea>, c_in=c_in@entry=58) at ./string/strchr.c:47
#1 0x0000003f9dd4891e in __GI_strstr (haystack=0x13ea <error: Cannot access memory at address 0x13ea>, needle=0x2ae7f53538 ":") at ./string/strstr.c:84
#2 0x0000003f9e213314 in g_strsplit () from /lib/riscv64-linux-gnu/libglib-2.0.so.0
#3 0x0000002ae7f5303a in ?? ()

which we correctly guessed was coming from maybe_add_rpath_introspection_paths() so rebuilding without HAVE_EXE_INTROSPECTION seems to be a workaround.

Private bug: https://launchpad.net/bugs/2012068