shithub: openh264

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Include -lpthread -lm in the pkg-config file when used as static library

When linking using the C++ frontend, -lm is included automatically,
but it has to be manually specified otherwise.

Likewise the -lpthread flag needs to be added in order to properly
link with the static library; it only worked previously if the user
included that flag already for some other reason.

--- a/build/platform-bsd.mk

+++ b/build/platform-bsd.mk

@@ -5,6 +5,7 @@

 SHLDFLAGS = -Wl,-soname,$(LIBPREFIX)$(PROJECT_NAME).$(SHAREDLIBSUFFIXMAJORVER)

 CFLAGS += -fPIC

 LDFLAGS += -lpthread

+STATIC_LDFLAGS += -lpthread -lm

 ifeq ($(ASM_ARCH), x86)

 ifeq ($(ARCH), x86_64)

 ASMFLAGS += -f elf64

--- a/build/platform-linux.mk

+++ b/build/platform-linux.mk

@@ -5,6 +5,7 @@

 SHLDFLAGS = -Wl,-soname,$(LIBPREFIX)$(PROJECT_NAME).$(SHAREDLIBSUFFIXMAJORVER)

 CFLAGS += -Wall -fno-strict-aliasing -fPIC -MMD -MP

 LDFLAGS += -lpthread

+STATIC_LDFLAGS += -lpthread -lm

 AR_OPTS = crD $@

 ifeq ($(ASM_ARCH), x86)

 ifeq ($(ARCH), x86_64)