Revert "php8: fix linking on riscv64 platform"

This reverts commit a2e76e4978.

Now that the issue is fixed on gcc side (see openwrt/openwrt@7b4a966),
we can revert this workaround here.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

lang/php8/Makefile

@@ -94,7 +94,7 @@ endef
 
 define Package/php8-cli
   $(call Package/php8/Default)
-  DEPENDS+= +PACKAGE_php8-mod-intl:libstdcpp +riscv64:libatomic
+  DEPENDS+= +PACKAGE_php8-mod-intl:libstdcpp
   TITLE+= (CLI)
 endef
 
@@ -105,7 +105,7 @@ endef
 
 define Package/php8-cgi
   $(call Package/php8/Default)
-  DEPENDS+= +PACKAGE_php8-mod-intl:libstdcpp +riscv64:libatomic
+  DEPENDS+= +PACKAGE_php8-mod-intl:libstdcpp
   TITLE+= (CGI & FastCGI)
 endef
 
@@ -127,7 +127,7 @@ endef
 
 define Package/php8-fpm
   $(call Package/php8/Default)
-  DEPENDS+= +PACKAGE_php8-mod-intl:libstdcpp +riscv64:libatomic
+  DEPENDS+= +PACKAGE_php8-mod-intl:libstdcpp
   TITLE+= (FPM)
 endef
 
@@ -159,7 +159,6 @@ define Package/apache-mod-php8
   CATEGORY:=Network
   DEPENDS+=PACKAGE_apache-mod-php8:apache \
 	   +PACKAGE_php8-mod-intl:libstdcpp \
-	   +riscv64:libatomic \
 	   +libpcre2 +zlib
   TITLE:=PHP8 module for Apache Web Server
 endef
@@ -198,9 +197,6 @@ endif
 ifeq ($(CONFIG_USE_MUSL),y)
 TARGET_CFLAGS += -D_LARGEFILE64_SOURCE
 endif
-ifneq ($(findstring riscv64,$(CONFIG_ARCH)),)
-TARGET_LDFLAGS += -latomic
-endif
 
 ifneq ($(SDK)$(CONFIG_PACKAGE_php8-mod-bcmath),)
   CONFIGURE_ARGS+= --enable-bcmath=shared
@@ -607,8 +603,6 @@ define BuildModule
   define Package/php8-mod-$(1)
     $(call Package/php8/Default)
 
-    DEPENDS+=+riscv64:libatomic
-
     ifneq ($(3),)
       DEPENDS+=$(3)
     endif