Bug 1585700 - Remove unconditional -mwindows from the mingw compilation r=nalexander

Differential Revision: https://phabricator.services.mozilla.com/D47921

--HG--
extra : moz-landing-system : lando

js/src/old-configure.in

@@ -532,9 +532,6 @@ case "$target" in
             AC_MSG_ERROR(Firefox cannot be built with mingw-gcc and requires a mingw-clang toolchain to work)
         fi
 
-        CC="$CC -mwindows"
-        CXX="$CXX -mwindows"
-        CPP="$CPP -mwindows"
         DSO_LDOPTS='-shared'
         # Use temp file for windres (bug 213281)
         RCFLAGS='-O coff --use-temp-file'

old-configure.in

@@ -650,9 +650,6 @@ case "$target" in
             AC_MSG_ERROR(Firefox cannot be built with mingw-gcc and requires a mingw-clang toolchain to work)
         fi
 
-        CC="$CC -mwindows"
-        CXX="$CXX -mwindows"
-        CPP="$CPP -mwindows"
         DSO_LDOPTS='-shared'
         # Use temp file for windres (bug 213281)
         RCFLAGS='-O coff --use-temp-file'