Fix MIPS, at least ET_EXEC.

ET_DYN not tested.  Also /proc/self/exe is not proected [use getenv("   ")]
	modified:   p_lx_elf.cpp
	modified:   stub/src/i386-linux.elf-main.c
	modified:   stub/src/mipsel.r3000-linux.elf-fold.S
	modified:   ../.github/travis_testsuite_1.sh

	also .h .dump .map for mips

src/p_lx_elf.cpp

@@ -3233,8 +3233,8 @@ void PackLinuxElf32mipsel::defineSymbols(Filter const *ft)
         adrc = adrm;
         adru = lo_va_stub;
         adrx = lo_va_stub + hlen;
-        lenm = page_size;
-        lenu = page_size + len;
+        lenm = 2*page_size;
+        lenu = 2*page_size + len;
         cntc = 0;
     }
     adrm = page_mask & (~page_mask + adrm);  // round up to page boundary