v1.5.0
Build all installed executables with -Wl,-z,now if available
m4: rewrite __attribute__((unused)) check
autotools: update deprecated macros
m4: rewrite ld -O1 check
m4: rewrite ld --as-needed check
m4: rewrite ld --no-undefined check
m4: make libprelude-config diagnostics less noisy
Add missing format function attributes and enable -Wmissing-format-attribute
configure.ac: rewrite WARN_CFLAGS initialization