Add alternate cross prefix for compilers to support android build

refs #13563

mythtv/configure

@@ -74,6 +74,7 @@ Standard options:
 
 Advanced options (experts only):
   --cross-prefix=PREFIX    use PREFIX for compilation tools [$cross_prefix]
+  --cross-prefix-cc=PREFIX use PREFIX for compiler compilation tools [$cross_prefix_cc]
   --enable-cross-compile   assume a cross-compiler is used
   --sysroot=PATH           root of cross-build tree
   --sysinclude=PATH        location of cross-build system headers
@@ -2104,6 +2105,7 @@ CMDLINE_SET="
     objcc
     cpu
     cross_prefix
+    cross_prefix_cc
     custom_allocator
     cxx
     dep_cc
@@ -3307,10 +3309,16 @@ if enabled cross_compile; then
     test -n "$arch" && test -n "$target_os" ||
         die "Must specify target arch (--arch) and OS (--target-os) when cross-compiling"
 fi
+test -z "$cross_prefix_cc" && cross_prefix_cc="$cross_prefix"
 
+test -n "$cc" && cc_default="$cc"
+test -n "$cxx" && cxx_default="$cxx"
 ar_default="${cross_prefix}${ar_default}"
-cc_default="${cross_prefix}${cc_default}"
-cxx_default="${cross_prefix}${cxx_default}"
+cc_default="${cross_prefix_cc}${cc_default}"
+cxx_default="${cross_prefix_cc}${cxx_default}"
+cc="$cc_default"
+cxx="$cxx_default"
+echo "cc_default $cc_default , ${cross_prefix_cc}"
 nm_default="${cross_prefix}${nm_default}"
 pkg_config_default="${cross_prefix}${pkg_config_default}"
 if ${cross_prefix}${ranlib_default} 2>&1 | grep -q "\-D "; then