icu: disable use of _strtod_l (#2709)

This function does not seem to be available on Windows XP
so disable by explicitly defining U_USE_STRTOD_L as 0.

Fixes #2708

mingw-w64-icu/PKGBUILD

@@ -10,7 +10,7 @@ _realname=icu
 pkgbase=mingw-w64-${_realname}
 pkgname=("${MINGW_PACKAGE_PREFIX}-${_realname}" "${MINGW_PACKAGE_PREFIX}-${_realname}-debug-libs")
 pkgver=58.2
-pkgrel=1
+pkgrel=2
 arch=('any')
 pkgdesc="International Components for Unicode library (mingw-w64)"
 arch=('any')
@@ -86,6 +86,7 @@ prepare() {
 
 build() {
   local -a extra_config
+  CXXFLAGS+=" -DU_USE_STRTOD_L=0" # breaks on Windows XP
   #CXXFLAGS+=" -D_WIN32_WINNT=0x0601"
   cd "${srcdir}/icu/"
   # For ICU we ignore the options for debug above and always