poco: disable fpenvironment for soft floating point configuration

Many platforms don't provide all FPU features needed by Poco when
configured for soft floating point in their fenv.h header. So
disable fpenvironment for this configuration to avoid build breakage.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit c735f39881cf49bc58ad1b8375fd630e8284ad21)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/poco/poco.mk

@@ -42,6 +42,11 @@ ifeq ($(BR2_sh4a)$(BR2_nios2),y)
 POCO_CONF_OPTS += --no-fpenvironment
 endif
 
+# disable fpenvironment for soft floating point configuration
+ifeq ($(BR2_SOFT_FLOAT),y)
+POCO_CONF_OPTS += --no-fpenvironment
+endif
+
 ifeq ($(BR2_STATIC_LIBS),y)
 POCO_MAKE_TARGET = static_release
 else ifeq ($(BR2_SHARED_LIBS),y)