Add gcc4 and gcc4-armhf packages (!216)

Successfully tested both the gcc4 compiler on x86_64 with a simple
program (fbdebug) and the gcc4-armhf cross-compiler to build a very old
u-boot port for Galaxy Nexus (a MR will follow soon) which failed to
boot with either newer version (6 and 8).

[skip ci]: already went through

main/gcc4/05_all_gcc48_gcc.c.patch

@@ -0,0 +1,25 @@
+2013-03-24	Magnus Granberg		<zorry@gentoo.org>
+
+		* gcc/gcc.c								include esp.h
+		static const char *cc1_spec 			We set that in esp.h if ENABLE_ESP.
+
+--- ./gcc/gcc.c	2010-01-21 10:29:30.000000000 -0500
++++ ./gcc/gcc.c	2010-01-29 23:29:16.000000000 -0500
+@@ -44,6 +44,7 @@
+ #include "opts.h"
+ #include "params.h"
+ #include "vec.h"
++#include "config/esp.h" /* for --enable-esp support */
+ #include "filenames.h"
+ 
+ /* By default there is no special suffix for target executables.  */
+@@ -822,7 +823,9 @@
+ 
+ static const char *asm_debug;
+ static const char *cpp_spec = CPP_SPEC;
++#ifndef ENABLE_ESP
+ static const char *cc1_spec = CC1_SPEC;
++#endif
+ static const char *cc1plus_spec = CC1PLUS_SPEC;
+ static const char *link_gcc_c_sequence_spec = LINK_GCC_C_SEQUENCE_SPEC;
+ static const char *link_ssp_spec = LINK_SSP_SPEC;