Add -Wextra to the list of compilation warnings. We're no longer warning-free,

but there's not much to fix.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@3534 92316355-f0b4-4df1-b90c-862c8a59935f

configure.ac

@@ -97,8 +97,8 @@ AC_SUBST(PIPI_TYPES)
 # Optimizations
 CFLAGS="${CFLAGS} -g -O2 -fno-strength-reduce -fomit-frame-pointer"
 # Code qui fait des warnings == code de porc == deux baffes dans ta gueule
-CFLAGS="${CFLAGS} -Wall -Wpointer-arith -Wcast-align -Wcast-qual -Wstrict-prototypes -Wshadow -Waggregate-return -Wmissing-prototypes -Wnested-externs -Wsign-compare"
-CXXFLAGS="${CXXFLAGS} -Wall -Wpointer-arith -Wcast-align -Wcast-qual -Wshadow -Wsign-compare"
+CFLAGS="${CFLAGS} -Wall -Wextra -Wpointer-arith -Wcast-align -Wcast-qual -Wstrict-prototypes -Wshadow -Waggregate-return -Wmissing-prototypes -Wnested-externs -Wsign-compare"
+CXXFLAGS="${CXXFLAGS} -Wall -Wextra -Wpointer-arith -Wcast-align -Wcast-qual -Wshadow -Wsign-compare"
 
 AC_CHECK_LIB(m, sin, MATH_LIBS="${MATH_LIBS} -lm")