Fix -latomic for CMake packages

The poppler package failed to build for me with errors such as this one:

    host/aarch64-buildroot-linux-gnu/include/c++/10.3.0/cstdlib:75:15: fatal error: stdlib.h: No such file or directory
       75 | #include_next <stdlib.h>
          |               ^~~~~~~~~~

Changing the CMake option to a link-specific one fixes the issue.

Also change other packages with the same issue: cutelyst, gerbera,
kf5-modemmanager-qt, kodi and wampcc.

Signed-off-by: Gleb Mazovetskiy <glex.spb@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 7333207eaf2900076185cba6641c6406d61c235e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/cutelyst/cutelyst.mk

@@ -18,7 +18,7 @@ CUTELYST_CONF_OPTS += \
 
 # Qt 5.8 needs atomics, which on various architectures are in -latomic
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
-CUTELYST_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
+CUTELYST_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic
 endif
 
 ifeq ($(BR2_PACKAGE_LIBPWQUALITY),y)

package/gerbera/gerbera.mk

@@ -22,7 +22,7 @@ GERBERA_CONF_OPTS = \
 
 # Uses __atomic_fetch_add_4
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
-GERBERA_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
+GERBERA_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic
 endif
 
 ifeq ($(BR2_PACKAGE_EXIV2),y)

package/kf5/kf5-modemmanager-qt/kf5-modemmanager-qt.mk

@@ -15,7 +15,7 @@ KF5_MODEMMANAGER_QT_INSTALL_STAGING = YES
 
 # Uses __atomic_fetch_add_4
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
-KF5_MODEMMANAGER_QT_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
+KF5_MODEMMANAGER_QT_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic
 endif
 
 $(eval $(cmake-package))

package/kodi/kodi.mk

@@ -67,7 +67,6 @@ KODI_DEPENDENCIES += host-automake host-autoconf host-libtool
 
 KODI_CONF_OPTS += \
 	-DCMAKE_C_FLAGS="$(TARGET_CFLAGS) $(KODI_C_FLAGS)" \
-	-DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) $(KODI_CXX_FLAGS)" \
 	-DENABLE_APP_AUTONAME=OFF \
 	-DENABLE_CCACHE=OFF \
 	-DENABLE_DVDCSS=ON \
@@ -165,7 +164,7 @@ endif
 
 # mips: uses __atomic_load_8
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
-KODI_CXX_FLAGS += -latomic
+KODI_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic
 endif
 
 ifeq ($(BR2_PACKAGE_KODI_PLATFORM_RBPI),y)

package/poppler/poppler.mk

@@ -21,7 +21,7 @@ POPPLER_CONF_OPTS = \
 	-DENABLE_GTK_DOC=OFF
 
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
-POPPLER_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
+POPPLER_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic
 endif
 
 ifeq ($(BR2_PACKAGE_BOOST),y)

package/wampcc/wampcc.mk

@@ -13,7 +13,7 @@ WAMPCC_LICENSE_FILES = LICENSE
 
 # Uses __atomic_fetch_add_8
 ifeq ($(BR2_TOOLCHAIN_HAS_LIBATOMIC),y)
-WAMPCC_CONF_OPTS += -DCMAKE_CXX_FLAGS="$(TARGET_CXXFLAGS) -latomic"
+WAMPCC_CONF_OPTS += -DCMAKE_EXE_LINKER_FLAGS=-latomic
 endif
 
 $(eval $(cmake-package))