Select the code to load at compile-time depending on the ICU lib's ve…

…rsion

spec/currencies_spec.cr

@@ -13,6 +13,7 @@ describe "ICU::Currencies" do
     end
   end
 
+  {% if compare_versions(LibICU::VERSION, "49.0.0") >= 0 %}
   describe "numeric_code" do
     it "returns the code associated to a currency" do
       ICU::Currencies.numeric_code("EUR").should eq(978)
@@ -24,4 +25,5 @@ describe "ICU::Currencies" do
       end
     end
   end
+  {% end %}
 end

spec/region_spec.cr

@@ -1,5 +1,6 @@
 require "./spec_helper"
 
+{% if compare_versions(LibICU::VERSION, "52.0.0") >= 0 %}
 describe "ICU::Region" do
   describe "initialize" do
     it "creates a new region from a code" do
@@ -57,3 +58,4 @@ describe "ICU::Region" do
     end
   end
 end
+{% end %}

src/icu/currencies.cr

@@ -16,9 +16,11 @@ class ICU::Currencies
     ICU.uchars_to_string(buff, len)
   end
 
+  {% if compare_versions(LibICU::VERSION, "49.0.0") >= 0 %}
   def self.numeric_code(currency : String) : Int32
     num = LibICU.ucurr_get_numeric_code(ICU.string_to_uchars(currency))
     raise ICU::Error.new(%(Unknown currency "#{currency}")) if num == 0
     num
   end
+  {% end %}
 end

src/icu/region.cr

@@ -1,3 +1,4 @@
+{% if compare_versions(LibICU::VERSION, "52.0.0") >= 0 %}
 class ICU::Region
   @uregion : LibICU::URegion
   @code : String?
@@ -47,3 +48,4 @@ class ICU::Region
     regions.map { |r| self.class.new(r) }
   end
 end
+{% end %}