Making 'bin2c' to be built with the compiler for the local system.

I copied the configure.ac code about CC_FOR_BUILD from libX11.

configure.ac

@@ -86,6 +86,15 @@ fi
 AC_PROG_CC
 AC_PROG_CXX
 
+# To build programs to be run in the build machine
+if test "$CC_FOR_BUILD" = ""; then
+    if test "$cross_compiling" = "yes"; then
+        AC_CHECK_PROGS(CC_FOR_BUILD, gcc cc)
+    else
+        CC_FOR_BUILD="$CC"
+    fi
+fi
+AC_SUBST([CC_FOR_BUILD])
 
 # We are going to use libtool.
 AC_DISABLE_STATIC

src/bin2c/Makefile.am

@@ -1,3 +1,6 @@
 noinst_PROGRAMS = bin2c
 
 bin2c_SOURCES = bin2c.c
+
+bin2c: bin2c.c
+       $(CC_FOR_BUILD) $(CFLAGS_FOR_BUILD) -o bin2c bin2c.c