configure.in (with-jemalloc): also check for header, for ABIs
which JEMALLOC_MANGLE is needed, i.e., Mach-O and PE-COFF
platforms. [ruby-core:62939] [Feature #9113]
include/ruby/missing.h: include alternative malloc header to
replace memory management functions.
dln.c, io.c, parse.y, st.c: undef malloc family before
re-definition to suppress warnings.
configure.in, missing.h: jemalloc mangling
which JEMALLOC_MANGLE is needed, i.e., Mach-O and PE-COFF
platforms. [ruby-core:62939] [Feature #9113]
replace memory management functions.
re-definition to suppress warnings.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46354 b2dd03c8-39d4-4d8f-98ff-823fe69b080e