gcc: update to version 7.4.0, Add config options

for coping libc.a, libpthread.a and libstdc++ to target.
Add config option to eliminate need for -lstdc++ and -lgcc_pic
switches when linking statically

Signed-off-by: Noble Pepper <noblepepper@gmail.com>

devel/gcc/patches/840-armv4_pass_fix-v4bx_to_ld.patch

@@ -1,6 +1,15 @@
+commit 7edc8ca5456d9743dd0075eb3cc5b04f4f24c8cc
+Author: Imre Kaloz <kaloz@openwrt.org>
+Date:   Wed Feb 2 19:34:36 2011 +0000
+
+    add armv4 fixup patches
+    
+    SVN-Revision: 25322
+
+
 --- a/gcc/config/arm/linux-eabi.h
 +++ b/gcc/config/arm/linux-eabi.h
-@@ -94,10 +94,15 @@
+@@ -88,10 +88,15 @@
  #define MUSL_DYNAMIC_LINKER \
    "/lib/ld-musl-arm" MUSL_DYNAMIC_LINKER_E "%{mfloat-abi=hard:hf}.so.1"