tools: Remove hardcoded use of -Werror

By hardcoding the use of -Werror, we risk that the build can break
on any newer (or older) toolchain which can give warnings for
unexpected issues.

Fixing such issues is of course desired, but we shouldn't be breaking
the build universally, unless the user explicitly has asked for
this behaviour.

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-tools/gendef/Makefile.am

diff --git a/mingw-w64-tools/gendef/Makefile.am b/mingw-w64-tools/gendef/Makefile.am
index 20bf6df..bcd8566 100644
--- a/mingw-w64-tools/gendef/Makefile.am
+++ b/mingw-w64-tools/gendef/Makefile.am
@@ -4,7 +4,7 @@
 
 gendef_SOURCES = src/gendef.h src/compat_string.h src/gendef.c src/gendef_def.c src/compat_string.c \
                  src/fsredir.c src/fsredir.h
-gendef_CFLAGS = $(AM_CFLAGS) -Werror -Wall -W
+gendef_CFLAGS = $(AM_CFLAGS) -Wall -W
 
 EXTRA_DIST = $(srcdir)/ChangeLog*
 DISTCHECK_CONFIGURE_FLAGS = --host=$(host) --with-mangle=@with_mangle@

mingw-w64-tools/genpeimg/Makefile.am

diff --git a/mingw-w64-tools/genpeimg/Makefile.am b/mingw-w64-tools/genpeimg/Makefile.am
index c7a5d5d..3f5219b 100644
--- a/mingw-w64-tools/genpeimg/Makefile.am
+++ b/mingw-w64-tools/genpeimg/Makefile.am
@@ -1,6 +1,6 @@
 bin_PROGRAMS = genpeimg
 genpeimg_SOURCES = src/img.h src/img.c src/img_pe.c src/genpeimg.c
 genpeimg_CPPFLAGS = -Isrc
-genpeimg_CFLAGS = $(AM_CFLAGS) -O3 -g -Werror -Wall -Wextra
+genpeimg_CFLAGS = $(AM_CFLAGS) -O3 -g -Wall -Wextra
 
 DISTCHECK_CONFIGURE_FLAGS = --host=$(host)